Vintage Air 751155 User manual

1955-59 Chevrolet Pickup
Evaporator Kit
with Standard Controls
751155
901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 1 OF 24
an ISO 9001:2008 Registered Company
18865 Goll St. San Antonio, TX 78266 ph: 210-654-7171 fax: [phone]

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901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 2 OF 24
Thank you for purchasing this evaporator kit from Vintage Air. When installing these
components as part of a complete SureFit™ system, Vintage Air recommends working
from front to back on the vehicle, installing the condenser kit, hose kit, and compressor
rst, followed by the wiring, evaporator, and nally the control panel.
Cover..................................................................................................................................
Table of Contents.................................................................................................................
Packing List/Parts Disclaimer..................................................................................................
Information Page..................................................................................................................
Wiring Notice.......................................................................................................................
Engine Compartment Disassembly, Condenser Assembly and Installation, Compressor and
Brackets.............................................................................................................................
Passenger Compartment Disassembly.....................................................................................
Defrost Duct Installation, Bracket & Evaporator Hardline Installation...........................................
Bracket & Evaporator Hardline Installation (Cont.), Center Louver A/C Plenum Installation.............
Firewall Modication, Firewall Modication (Cont.)...................................................................
Evaporator Installation........................................................................................................
Drain Hose Installation, Lubricating O-rings............................................................................
Heater Hose & Heater Control Valve Installation......................................................................
A/C and Heater Hose Routing (1955-57 Models Only)..............................................................
A/C and Heater Hose Routing (1958-59 Models Only)..............................................................
Driver Side Under Dash Louver Installation, Passenger Side Under Dash Louver
Installation........................................................................................................................
Final Steps........................................................................................................................
Control Panel & Duct Hose Routing.......................................................................................
Wiring Diagram..................................................................................................................
Gen IV Wiring Connection Instruction....................................................................................
Operation of Controls..........................................................................................................
Troubleshooting Guide.........................................................................................................
Troubleshooting Guide (Cont.)..............................................................................................
Packing List.......................................................................................................................
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Table of Contents

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901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 3 OF 24
Evaporator Kit (751155)
1
Accessory Kit
791155
2
No. Qty. Part No. Description
NOTE: Images may not depict actual parts and quantities.
Refer to packing list fo r actual parts and quantities.
Gen IV Evaporator
Sub Case
744012
Gen IV Evaporator Sub Case
Accessory Kit
1.
2.
1
1
744012
791155
** Before beginning installation, open all packages and check contents of shipment.
Please report any shortages directly to Vintage Air within 15 days. After 15 days,
Vintag e Air will not be responsible for missing or damaged items.
Packing List

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901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 4 OF 24
Important Notice—Please Read
For Maximum System Performance, Vintage Air Recommends the Following:
New Vintage Air-supplied Sanden Compressor: No additional oil needed (Compressor is shipped with
proper oil charge).
All Other Compressors: Consult manufacturer (Some compressors are shipped dry and will need oil
added).
NOTE: Vintage Air systems are designed to operate with R134a refrigerant only.
Use of any other refrigerant could damage your A/C system and/or vehicle, and
possibly cause a fire, in addition to potentially voiding the warranties of the A/C
system and its components.
Refrigerant Capacities:
Vintage Air System: 1.8 lbs. (1 lb., 12 oz.) of R134a, charged by weight with a quality charging station or
scale. NOTE: Use of the proper type and amount of refrigerant is critical to system operation and
performance.
Other Systems: Consult manufacturer’s guidelines.
Lubricant Capacities:
Safety Switches
Service Info:
Protect Your Investment: Prior to assembly, it is critical that the compressor, evaporator, A/C hoses and
fittings, hardlines, condenser and receiver/drier remained capped. Removing caps prior to assembly will
allow moisture, insects and debris into the components, possibly leading to reduced performance and/or
premature failure of your A/C system. This is especially important with the receiver/drier.
Additionally, when caps are removed for assembly, BE CAREFUL! Some components are shipped under
pressure with dry nitrogen.
Evacuate the System for 35-45 Minutes:
Ensure that system components (Drier, compressor, evaporator
and condenser) are at a temperature of at least 85° F. On a cool day, the components can be heated with a
heat gun or by running the engine with the heater on before evacuating. Leak check and charge to
specifications.
Your Vintage Air system is equipped with a binary pressure safety switch. A binary switch disengages the
compressor clutch in cases of extreme low pressure conditions (Refrigerant Loss) or excessively high head
pressure (406 PSI) to prevent compressor damage or hose rupture. A trinary switch combines Hi/Lo
pressure protection with an electric fan operation signal at 254 PSI, and should be substituted for use with
electric fans. Compressor safety switches are extremely important since an A/C system relies on refrigerant
to circulate lubricant.
Bolts Passing Through Cowl and/or Firewall:
To ensure a watertight seal between the passenger compartment and the vehicle exterior, for all bolts
passing through the cowl and/or firewall, Vintage Air recommends coating the threads with silicone prior to
installation.
Heater Hose (Not Included With This Kit):
Heater hose may be purchased from Vintage Air (Part# 31800-VUD) or your local parts retailer. Routing and
required length will vary based on installer preference.

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901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 5 OF 24
Important Wiring Notice—Please Read
Some Vehicles May Have Had Some or All of Their Radio Interference Capacitors Removed.
There Should Be a Capacitor Found At Each of the Following Locations:
1. On the positive terminal of the ignition coil.
2. If there is a generator, on the armature terminal of the generator.
3. If there is a generator, on the battery terminal of the voltage regulator.
Most alternators have a capacitor installed internally to eliminate what is called “whining” as
the engine is revved. If whining is heard in the radio, or just to be extra cautious, a radio
interference capacitor can be added to the battery terminal of the alternator.
It is also important that the battery lead is in good shape and that the ground leads are not
compromised. There should be a heavy ground from the battery to the engine block, and
additional grounds to the body and chassis.
If these precautions are not observed, it is possible for voltage spikes to be present on the
battery leads. These spikes come from ignition systems, charging systems, and from
switching some of the vehicle’s other systems on and off. Modern computer-operated
equipment can be sensitive to voltage spikes on the power leads, which can cause unexpected
resets, strange behavior, and/or permanent damage.
Vintage Air strives to harden our products against these types of electrical noise, but there is
a point where a vehicle’s electrical system can be degraded so much that nothing can help.
Radio interference capacitors should be available at most auto and truck parts suppliers. They
typically are cylindrical in shape, a little over an inch long, a little over a half inch in diameter,
and they have a single lead coming from one end of the cylinder with a terminal on the end of
the wire, as well as a mounting clip which is screwed into a good ground on the vehicle. The
specific value of the capacitance is not too significant in comparison to ignition capacitors that
are matched with the coil to reduce pitting of the points.
Care must be taken, when installing the compressor lead, not to short it to ground.
The compressor lead must not be connected to a condenser fan or to any other
auxiliary device. Shorting to ground or connecting to a condenser fan or any other
auxiliary device may damage wiring, the compressor relay, and/or cause a
malfunction.
When installing ground leads on Gen IV systems, the blower control ground and ECU
ground must be connected directly to the negative battery post.
For proper system operation, the heater control valve must be connected to the
ECU.
•
•
•

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901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 6 OF 24
Figure 1
Core Support
Cover
Horns
Battery
Battery
Tray
Engine Compartment Disassembly
1.
2.
3.
4.
5.
6.
7.
NOTE: Before starting the installa tion, check the function of the vehicle (horn, lights, etc.) for proper
operatio n, and study the instructions, illustrations, & diagrams.
Perform the Following:
Disconnect the battery.
Remove the battery and battery tray (retain).
Remove the top cover on the radiator core support (retain).
Remove the OEM fan & fan shroud (retain).
Drain and remove the radiator (retain).
Remove the passenger side horn (retain).
Remove all OEM heater hoses (discard).
Condenser Assembly and Installation
Refer to separate instructions included with the condenser kit to install the condenser.
Binary switch installation (Refer to condenser instructions).
1.
2.
Compressor and Brackets
Refer to separate instructions included with the bracket kit to install the compressor and bracket.1.

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901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 7 OF 24
Figure 2
OEM Defrost
Ducts
OEM Heater
Assembly
Glove
Box
OEM
Control
Panel
(Remove)
Passenger Side
OEM Vent Control
(Relocate)
Driver Side
OEM Vent Control
Glove Box
Door
Figure 2b
Figure 2a
Approx.
3”
Cut &
Remove After
Bend
Bend
1/2”
Passenger Side
Fresh Air
Door
Silicone
Passenger Compartment
Disassembly
1.
2.
3.
4.
5.
6.
7.
8.
9.
Perform the Following:
Remove the glove box door (retain) and glove box (discard).
Disconnect all wires and cables from the control panel.
Remove the control panel (discard).
Remove the passenger side OEM vent control (discard), and close and seal the kick panel vent with silicone
(See Figure 2b, below).
Relocate the driver side OEM vent control next to the steering column using OEM screws (See Figure 2, below).
Remove the OEM heater assembly (discard).
Remove the OEM duct hoses from the defrost ducts (discard).
Remove the OEM defrost ducts (discard).
Modify the passenger side glove box door arm as shown in Figure 2a, below. NOTE: Glove box door travel
will be restricted to prevent interference with evaporator case assembly.
Remove & discard the driver side glove box door arm.
10.

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901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 8 OF 24
Defrost
Duct
62144-VCE
(2) #8 x 1/2”
Pan Head
Screws
Figure 4
Figure 3
Defrost
Duct
62144-VCE
Evaporator
Rear Bracket
643082
(2) 1/4-20 x 1/2”
Hex Bolts
(Supplied on Evaporator Sub Case)
ECU Module
#6
O-ring
(2) 1/4-20 x 1/2”
Hex Bolts
(Supplied on Evaporator Sub Case)
#6 Liquid Line
092160
Defrost Duct Installation
Install the driver and passenger side defrost ducts using (2) #8 x 1/2” pan head screws as shown in Figure 3,
below.
1.
Bracket & Evaporator Hardline Installation
1.
2.
On a workbench, install the evaporator rear bracket using (4) 1/4-20 x 1/2” hex bolts (supplied on the
evaporator sub case) (See Figure 4, below).
Install the hardlines with properly lubricated O-rings (See Figure 4, below, Figure 5, Page 9, and Figure 11,
Page 12).

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901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 9 OF 24
Figure 5
Figure 6
#6 Liquid Line
092160
Heater Line
(Evaporator to Water Pump)
092162
#10 O-ring
Heater Line
(Evaporator to Intake)
092163
Center Louver
A/C Plenum
496102
(2) 10-32 x 1/2”
Pan Head
Screws
Bracket & Evaporator
Hardline Installation (Cont.)
Center Louver A/C Plenum Installation
Install the center louver A/C plenum onto the evaporator sub case using (2) 10-32 x 1/2” pan head screws as
shown in Figure 6, below.
1.

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901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 10 OF 24
OEM Holes
(Enlarge to 1 ¼”
if Necessary)
Enlarge
to 5/8”
Figure 7
Figure 8
OEM Foam
Insulation
OEM Foam
Insulation (4) Large
Grommets
33137-VUI
Cut and
Remove
View From
Passenger Side
Inside of Cab View From
Passenger Side
Inside of Cab
13 ½”
8 ½”
Firewall Modification
Drill (2) 1 ¼” holes and (2) 3/8” holes into the firewall (See Figure 7, below).
Enlarge an OEM hole in the firewall to 5/8” as shown in Figure 7, below.
1.
2.
Firewall Modification (Cont.)
Cut & remove the OEM foam insulation as shown in Figure 8, below.
Install (4) large grommets as shown in Figure 8, below.
1.
2.
Drill
1¼” Hole OEM
Hole
5 ”
7 ”
4 ”
4 ⅝”
10”
OEM
Hole
Drill
3/8” Hole
55-59 Chevy Pickup
Firewall Indention
(Engine Side)
Factory
Stamp
Factory
Stamp
Factory
Stamp
OEM
Hole
Drill
3/8” Hole
15/16”
2 ”

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901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 11 OF 24
Evaporator Installation
1.
2.
3.
4.
5.
6.
7.
8.
9.
Lift the evaporator unit up under the dashboard. Secure loosely to the rewall using (2) 1/4-20 x 1” hex bolts
and (2) 1/4” washers (See Figure 9, below). NOTE: To ensure proper drainage, it is very important that
the evaporator is level, both left-right and fore-aft. Check for level on the at portions of the case
around the drain.
Install the evaporator front bracket onto the evaporator using (2) 1/4-20 x 1/2” hex bolts, and tighten as
shown in Figure 9, below.
Remove & replace the OEM screws in the glove box mounting brackets. Replace with (2) 10-32 x 1” pan head
screws.
Secure the evaporator front bracket to the OEM glove box mounting bracket using (2) 3/16” SAE at washers
and (2) 10-32 nuts with star washers (See Figure 9a, below).
Using the center louver A/C plenum as a guide, mark and drill (2) 5/32” holes into the dash bottom (See
Figure 9, below).
Secure the evaporator plenum to the dash using (2) #8 x 1/2” pan head screws, and install (2) 1/2” plastic
plugs into the holes as shown in Figure 9, below.
Install the (2) louvers into the evaporator plenum as shown in Figure 9, below.
Verify that the evaporator unit is level and square to the dash; then tighten all mounting bolts. NOTE: Tighten
the bolt on the rewall rst. Then tighten the front mounting bracket.
Install the #10 suction line as shown in Figure 9b, below. NOTE: Wrap the #10 tting connections with
press tape.
NOTE: To ensure a watertight seal between the passenger compartment and the vehicle exterior, for
all bolts passing through the rewall, Vintage Air recommends coating the threads with silicone prior
to installation. Before installing the evaporator assembly under the dashboard, the glove box door
hinge needs to be reinstalled (if removed). Once the evaporator assembly is installed, there will be
insucient clearance to reinstall the glove box door hinge.
Perform the Following:
NOTE: After installing #10 suction line, wrap all
exposed metal (tting & tube) with supplied press
tape.
Press Tape
#10 Suction Line
092161
Evaporator Front
Bracket
643083
(2) 10-32 Nuts
with Star Washers
18251-VUB
(2)
1/4-20 x 1/2”
Hex Bolts
(2)
3/16” SAE
Flat Washers
OEM
Glove Box
Mounting
Bracket
OEM Glove Box
Mounting Bracket
(2) 1/4-20 x 1”
Hex Bolts
(2) 1/4”
Washers
Mark & Drill
(2) 5/32” Holes
(2) #8 x 1/2”
Pan Head Screws (2) 1/2” Plastic Plugs
(2) Louvers
(2) 10-32 x 1”
Pan Head Screws
Replace These
OEM Screws
Before Installing
Evaporator
#10 O-ring
Figure 9
Figure 9b Figure 9a
View From
Passenger Side
Inside of Cab

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901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 12 OF 24
Figure 10
Evaporator
Case
1”
Drain
Hose
Drain Hose Installation
Locate the evaporator drain on the bottom
of the evaporator case.
In line with the drain, lightly make a mark
on the firewall. Measure 1” down and drill a
5/8” hole into the firewall.
Install the drain hose onto the bottom of
the evaporator unit and route it through
the firewall. Install a 1/2” 90° drain elbow
onto the drain hose.
1.
2.
3.
1”
Figure ##
O-ring Installs
Over Male Insert
to Swaged Lip
O-ring
#6 O-ring
#8 O-ring #10 O-ring
O-ring
Supplied Oil
for O-rings
Male
Insert Female Nut
Hold With
This Wrench
Twist With
This Wrench
Lubricating O-rings
For a proper seal of fittings: Install supplied
O-rings as shown, and lubricate with supplied
oil.
NOTE: Standard torque specifications:
#6: 11 to 13 ft-lb.
#8: 15 to 20 ft-lb.
#10: 21 to 27 ft-lb.
Figure 11
1/2” 90°
Drain Elbow

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901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 13 OF 24
Figure 12
Heater Hose &
Heater Control Valve Installation
1.
2.
Route a 90° heater hose through the rewall, and connect to the heater line on the evaporator as shown in
Figure 12, below. Route the other end of the hose to the water pump, and secure using hose clamps. NOTE: A
small amount of silicone spray will ease heater hose installation.
Route a 90° heater hose through the rewall, and connect to the heater line on the evaporator. Route the
other end of the hose to the intake. NOTE: Install heater control valve in line with intake manifold
(pressure side) heater hose, and secure using hose clamps as shown. Also note proper ow
direction.
Heater
Hoses
Heater
Hoses
Hose
Clamps
#6 Liquid
Line
#10 Suction
Line
From Heater
Control Valve
to Evaporator From Intake
Manifold
From Evaporator
to Water Pump
NOTE: Flow direction follows molded
arrow on valve.

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901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 14 OF 24
Heater
Hoses
NOTE: Flow direction follows
molded arrow on valve.
#8 Condenser/Compressor
Hardline
095020
#6 Condenser/Drier
Hardline
095019
From Evaporator
to Water Pump
From Heater
Control V
alve to
Evaporator
#6 Adel
Clamp
31602-VUD
#8 Discharge
Hose
096015
Tie Wrap
#10 Suction
Hose
096010
Heater Hose
(Heater Control
Valve/Intake)
#6 A/C Hose
096014
Safety
Switch
(Binary Type)
NOTE: Vintage Air Systems use 5/8” heater connections. On engines equipped with 3/4” hose
nipples, these will need to be removed and replaced with 5/8” nipples (not supplied). For water
pumps with a cast-in 3/4” heater outlet, a 3/4” x 5/8” reducer tting (not supplied) will need
to be installed in the heater hose.
From Intake
Manifold
Figure 13
A/C and Heater Hose Routing
(1955-57 Models Only)
1.
2.
3.
Locate the #8 compressor A/C hose. Lubricate (2) #8 O-rings (See Figure 11, Page 12) and connect the 135°
female tting with service port to the #8 discharge port on the compressor. Then route the 90° female tting
to the #8 condenser hardline coming through the core support (See Figure 13, below). Tighten each tting
connection as shown in Figure 11, Page 12.
Locate the #10 compressor A/C hose. Lubricate (2) #10 O-rings (See Figure 11, Page 12) and connect the
135° female tting with service port to the #10 suction port on the compressor. Then route the 90° female
tting to the #10 evaporator hardline (See Figure 12, Page 13, and Figure 13, below). Tighten each tting
connection as shown in Figure 11, Page 12.
Locate the #6 evaporator/drier hose. Lubricate (2) #6 O-rings (See Figure 11, Page 12) and connect the 90°
female tting to the drier. Then route the other 90° female tting to the #6 evaporator hardline (See Figure
12, Page 13, and Figure 13, below). Tighten each tting connection as shown in Figure 11, Page 12.
Standard Hose Kit:
1. Refer to separate instructions included with modied hose kit.
Modied Hose Kit:

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901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 15 OF 24
NOTE: Vintage Air Systems use 5/8” heater connections. On engines equipped with 3/4” hose
nipples, these will need to be removed and replaced with 5/8” nipples (not supplied). For water
pumps with a cast-in 3/4” heater outlet, a 3/4” x 5/8” reducer tting (not supplied) will need
to be installed in the heater hose.
From Intake
Manifold
Figure 14
A/C and Heater Hose Routing
(1958-59 Models Only)
1.
2.
3.
Locate the #8 compressor A/C hose. Lubricate (2) #8 O-rings (See Figure 11, Page 12) and connect the 135°
female tting to the #8 discharge port on the compressor. Then route the straight female tting with service
port to the #8 condenser hardline coming through the core support (See Figure 14, below). Tighten each
tting connection as shown in Figure 11, Page 12.
Locate the #10 compressor A/C hose. Lubricate (2) #10 O-rings (See Figure 11, Page 12) and connect the
135° female tting with service port to the #10 suction port on the compressor. Then route the 90° female
tting to the #10 evaporator hardline (See Figure 12, Page 13, and Figure 14, below). Tighten each tting
connection as shown in Figure 11, Page 12.
Locate the #6 evaporator/drier hose. Lubricate (2) #6 O-rings (See Figure 11, Page 12) and connect the
straight female tting with the binary switch service port to the #6 drier hardline coming through the core
support. Then route the 90° female tting to the #6 evaporator hardline (See Figure 12, Page 13, and Figure
14, below). Tighten each tting connection as shown in Figure 11, Page 12.
Standard Hose Kit:
1. Refer to separate instructions included with modied hose kit.
Modied Hose Kit:
Tie Wrap
Heater
Hoses
#6 Drier/Core
Hardline
095018
Safety
Switch
(Binary Type)
From Evaporator
to Water Pump
From Heater
Control Valve to
Evaporator
#6 Adel Clamp
31602-VUD
#8 Discharge
Hose
096009
#10 Suction
Hose
096010
Heater Hose
(Heater Control
Valve/Intake)
NOTE: Flow direction follows
molded arrow on valve.
#6 A/C Hose
096008
#8 Condenser/Compressor
Hardline
095017
#6 Condenser/Drier
Hardline
095016

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901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 16 OF 24
Figure 15
Figure 16
OEM
Screw
OEM
Screw
Driver Side
Louver
496099
Passenger Side
Louver
496100
1/2”
Plastic Plug
31102-GUR
1/2”
Plastic Plug
31102-GUR
Driver Side
Under Dash Louver Installation
Install the driver side louver under the dash, and secure it using an OEM screw as shown in Figure 15, below.
Install a 1/2” plastic plug into the driver side louver as shown in Figure 15, below.
1.
2.
Passenger Side
Under Dash Louver Installation
1.
2.
Install the passenger side louver under the dash and secure it using an OEM screw as shown in Figure 16,
below.
Install a 1/2” plastic plug into the passenger side louver as shown in Figure 16, below.

17
901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 17 OF 24
Final Steps
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
Install the duct hoses as shown in Figure 19, Page 18.
Route the A/C wires (12 volt/ground/binary switch/heater valve) through the 3/8” grommet as shown in
Figure 17, below.
Install the control panel assembly. Refer to the control panel instructions.
Plug the wiring harnesses into the ECU module on the sub case as shown in Figure 19, Page 18 (Wire
according to wiring diagrams on Pages 19 and 20).
Install the new glove box using (5) OEM screws (See Figure 18, below).
Install the glove box door. NOTE: The glove box door opening and capacity will be very limited with
the Gen IV system.
Reinstall all previously removed items.
Fill radiator with at least a 50/50 mixture of approved antifreeze and distilled water. It is the owner’s
responsibility to keep the freeze protection at the proper level for the climate in which the vehicle is operated.
Failure to follow antifreeze recommendations will cause heater core to corrode prematurely and possibly burst
in A/C mode and/or freezing weather, voiding your warranty.
Double check all ttings, brackets and belts for tightness.
Vintage Air recommends that all A/C systems be serviced by a certied automotive air conditioning technician.
Evacuate the system for a minimum of 45 minutes prior to charging, and perform a leak check prior to
servicing.
Charge the system to the capacities stated on Page 4 of this instruction manual.
See Operation of Controls procedures on Page 21.
Figure 17
Grommet
33144-VUI
Glove Box
624980
(5) OEM
Screws
Figure 18
Wiring Harness
(12 Volt/Ground/Binary Switch)
Wiring Harness
(Heater Control Valve)

18
901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 18 OF 24
Figure 19
Passenger Side
Defrost Duct
2” x 10”
Driver Side
Defrost Duct
2” x 24”
Glove
Box
Duct Hose
Retainer
624989
Windshield
Duct
Hose
Dash
Passenger Side
Louver
2½” x 40”
Driver Side
Louver
2½” x 30”
Plug From
Control
Wiring Harness
232002-VUA
Plug From
Wiring
Harness
232600-VUA
End View of
Glove Box Area
Control Panel
& Duct Hose Routing

19
901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 19 OF 24
WHT/GRN
WHT/YEL
WHT/RED
RED
WHT
BACKLIGH T NEG
FAN WIPER
MODE WIPER
TEMP WIPER
5V- SW
GND
BACKLIGH T POS
AC ANNUNCIATOR
PRE-WIRED
GEN IV WIRING DIAGRAM
REV D, 5/6/2014
GEN IV ECU
PROGRAM
Wiring Diagram
TEMP
MODE
FAN
A/C
(IF USED)
232007-VUR
232002-VUA
** CIRCUIT
BREAKER
30 AMP
*** WIDE OPEN
THROTTLE
SWITCH
(OPTIONAL)
* DASH LAMP
(IF USED)
Dash Lamp Is Used Only With Type 232007-VUR Harness.
Warning: Always Mount Circuit Breaker As Close to the Battery As Possible. (NOTE: Wire Between
Battery and Circuit Breaker Is Unprotected and Should Be Carefully Routed to Avoid a Short
Circuit).
Wide Open Throttle Switch Contacts Close Only at Full Throttle, Which Disables A/C
Compressor.
JF8
BLK
ORA
TAN
VIEWED FROM WIRE SIDE
•
•
•
HEATER
CONTROL VALVE

20
901189 REV D 02/02/17, INST 55-59 CHEV P-UP w/ STANDARD CONTROLS EVAP KIT PG 20 OF 24
RED
CIRCUIT BREAKER
30 AMP
+
+
-
BLACK
RED
WHITE
RED
CHASSIS GROUND
A/C
COMPRESSOR
RELAY
Ignition Switch:
Dash Light:
NOTE:
MOUNT RELAY
IN DESIRED
LOCATION
UNDER DASH
GREEN
FIREWALL
BLUE
BLUE
RED
&
WHITE
VIOLET
(IGNITION HOT
TERMINAL)
IGNITION
SWITCH
DASH BACK LIGHT+0-12v
TAN
GRAY
BLUE
WHITE
WHITE
RED
RED
WHITE
COMPRESSOR
BATTERY
NOTE: CONNECT WHITE
WIRES DIRECTLY TO
(-) BATTERY TERMINAL
BAT
RUN
12V
RED
GREEN
RED
RED
BLUE
LATCH
BLACK
BINARY
SAFETY
SWITCH
YELLOW
ORANGE
WIRING
HARNESS
Violet 12V Ign Switch Source (Key On
Accessory) Position Must Be Switched.
Tan Wire Used Only With Vintage Air
Supplied Control Panel With LED Back
Light.
Binary: Connect As Shown (Typical
Compressor Wiring). Be Sure
Compressor Body Is Grounded.
Trinary Switch: Connect According To
Trinary Switch Wiring Diagram.
Install With Servo Motor Facing Down,
As Shown. Note Flow Direction Arrow
Molded Into Valve Body, And Install
Accordingly.
White Must Run To (-) Battery. Red May
Run To (+) Battery Or Starter. Mount
Circuit Breaker As Close to Battery As
Possible.
Heater Control Valve:
Binary/Trinary & Compressor:
Circuit Breaker/Battery:
CONTROL
WIRING
HARNESS
NOTE:
YELLOW & ORANGE
COMING FROM
HARNESS ARE NOT
USED.
WIRING
HARNESS
GRAY WIRE IS USED FOR
PROGRAMING CONTROLS
IF APPLICABLE
WIRING
HARNESS
Gen IV Wiring
Connection Instruction
HEATER
CONTROL VALVE
WARNING:
ALWAYS MOUNT CIRCUIT BREAKER
AS CLOSE TO THE BATTERY AS POSSIBLE.
(NOTE: WIRE BETWEEN BATTERY AND
CIRCUIT BREAKER IS UNPROTECTED
AND SHOULD BE CAREFULLY ROUTED
TO AVOID A SHORT CIRCUIT).
NOTE: HEATER CONTROL
VALVE CONNECTION AND
CHASSIS GROUND MAY BE
LOCATED ON EITHER SIDE
OF THE FIREWALL. ENSURE
CONNECTOR IS LATCHED
FIRMLY.