Vintage Air 1970-72 Cutlass User manual

1970-72 Cutlass
without Factory Air
561076
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC 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]

2
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 2 OF 24
Table of Contents
1. Cover
2. Table Of Contents
3. Packing List/Parts Disclaimer
4. Information Page
5. Wiring Notice
6. Engine Compartment, Condenser Assembly, Compressor & Bracket
&
Pulleys
Figure 1
7. Passenger Compartment
Figures 2 & 2a
8. Kick Panel Modification
Figures 3, 4 & 4a
9.
Defrost Duct Installation & Driver & Passenger Side Hose Adapter
Installation
Figures 5, 5a & 6
10. Fresh Air
Cover Installation & Kick Panel Fresh Air Cap Installation
Figures 7, 8, 8a & 8b
11. Firewall
Cover Installation & Evaporator Installation
Figures 9 & 10
12. Bracket
Installation (Cont.)
Figure 11
13.
Evaporator Installation (Cont. )
Figures 12 & 13
14.
Drain Hose Installation, Lubricating O-rings, & A/C Hose Installation
Figures 14 & 15
15.
A/C & Heater Hose Routing
Figure 16
16. Final Steps
Figures 17 & 18
17.
Control Panel & Duct Hose Routing
Figures 19 & 20
18.
Wiring Diagram
19.
Gen IV Wiring Connection Instructions
20. Operation Of Controls
21. Tr
oubleshooting Information
22. Tr
oubleshooting Information (Cont. )
23. Kick Panel Template
24. Evaporator Kit Packing List

3
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 3 OF 24
1.
2.
1
1
744004-VUE
781176
No. Qty. Part No. Description
Accessory Kit
781176
1
Gen IV 4-Vent Evap. Sub Case w/ 204
1970-72 Cutlass without A/C Acc. Kit
2
OFF
DASH
HOT
AC
FAN HI
DEF
FLR
COLD
Gen IV 4-Vent
Evap Sub Case
w/204 ECU
744004-VUE
Packing List
Evaporator Kit (561076)
** 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.
NOTE: Images may not depict actual parts and quantities.
Refer to packing list for actual parts and quantities.

4
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 4 OF 24
Use of Any Other Refrigerants Will Void All Warranties of the Air
Conditioning System and Components. Use of the Proper Type and
Amount of Refrigerant Is Critical to Proper System Operation. Vintage
Air Recommends Our Systems Be Charged By Weight With a Quality
Charging Station or Scale.
Service Info:
Safety Switches:
Important Notice—Please Read
Attention: The following system components are capped: Compressor, evaporator, condenser & drier.
Caps may be under pressure with dry nitrogen. Be careful removing caps. Do not remove caps prior to
installation. Removing caps prior to installation will cause components to collect moisture and lead to
premature failure and reduced performance.
Evacuate the system for 35-45 minutes with system components (Drier, compressor, evaporator and
condenser) 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.
For Maximum System Performance, Vintage Air Recommends the Following:
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.
Vintage Air Systems Are Designed to Operate With R134a
Refrigerant Only! Use of Any Other Refrigerants Is a Fire Hazard and
Could Damage Either Your Air Conditioning System or Your Vehicle.
Refrigerant Capacity for Vintage Air Systems:
(For other systems, consult manufacturer’s guidelines)
R134a System
Charge with 1.8 lbs. (1 lb., 12 oz.) of refrigerant.
Lubricant Capacities:
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).
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 carry lubrication through the system.
Heater Hose (Not Included With This Kit):
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.
Bolts Passing Through Cowl and/or Firewall:

5
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC 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 will cause severe damage to the ECU.
When installing ground leads on Gen IV systems, the blower control ground and
ECU ground must be connected directly to the negative battery post.
The heater control valve is a normally open valve. It must be connected to the
ECU to block water flow in MAX A/C mode.
•
•
•

6
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 6 OF 24
Disconnect battery.
Battery & battery tray (retain).
Drain radiator.
OEM blower motor assembly. NOTE: To remove the OEM blower motor assembly (under hood)
and the OEM heater assembly (under dash), the factory manual indicates doing the following:
Remove the right inner fender.
OEM heater hoses (discard) (See Figure 1, below).
OEM heater wiring/vacuum harness molded grommet (See Figure 1, below).
1.
2.
3.
4.
5.
6.
1.
2.
1.
1.
Inner
Fender Panel
Heater Hose
Clamp
OEM
Blower Motor
ASM
Engine Compartment
Remove the Following:
Figure 1
Condenser Assembly & Installation
Refer to separate instructions included with the condenser kit to install the condenser.
Binary switch installation (Refer to condenser instructions).
Refer to separate instructions included with the bracket kit to install the compressor bracket.
In most instances, the belt lengths will remain the same.
Compressor & Brackets
Pulleys
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.

7
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 7 OF 24
Remove glove box door (retain) and glove box (discard) (See Figure 2, below).
Disconnect all wires and cables from control panel and radio.
Remove radio (retain) and control panel (discard).
All ducting from OEM louvers (See Figure 2, below).
OEM defrost duct assembly by straightening 4 metal tabs (See Figure 2, below) .
OEM A/C and heater assembly (discard) (See Figure 2, below).
Install center louver assembly in dash as shown in Figure 2a, below.
1.
2.
3.
4.
5.
6.
7.
Passenger Compartment
Remove the Following:
Defrost Duct
ASM
Metal
Tabs
Metal
Tabs
OEM
A/C and Heater
Assembly
Figure 2
Control
Panel
Front of
Dash
Top View
Radio
Center Louver
Plate
Door
Flap
Ducting
Ducting
Glove Box
& Glove Box
Door
Figure 2a
Front of
Dash
Back Side
of Dash
Center Louver
ASM
496107

8
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 8 OF 24
Kick Panel Modification
Figure 3
Figure 4
Figure 4a
Fresh Air
Door ASM
Pull Cable
Assemblies
Fresh Air
Door ASM
OEM
Screws
Template
31102-GUR
1/2 Plastic
Plug
Kick Panel
Grille
Remove kick panel grille (discard). Remove kick panel by removing (5) OEM screws from the fresh air
door assembly. Disconnect and discard pull cable assemblies from the kick panel (See Figure 3, below).
Install 1/2” plastic plugs to fill the holes left from the removal of the pull cable assembly (See Figure 4,
below).
Place template provided on Page 23 onto kick panel as shown in Figure 4a.
Cut fresh air door assembly as shown in Figure 4, below.
Reinstall kick panel.
1.
2.
3.
4.
5.
KICK PANEL CUT-OUT
TEMPLATE
Cut
Out
Template
Cut This
Section
Out

9
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 9 OF 24
Driver & Passenger Side
Hose Adapter Installation
Install S-clips on hose adapters as
shown in Figure 6, below.
Install adapter on driver and
passenger side OEM louvers.
See Figure 6, below.
1.
2.
Driver & Passenger
Side OEM Louver
Figure 5
Figure 5a
Defrost Duct Installation
Install defrost ducts under dash and align with OEM opening. Install the passenger side defrost duct to the
cowl using #10 X 1/2” sheet metal screws. See Figure 5, below. Note: Driver side defrost duct installs
behind steering column brace and secures using steering column OEM bolt as shown below.
Install astro vent cap with S-clips as shown in Figure 5a, below.
1.
2.
OEM
Defrost Duct
Opening
Def Duct
Cowl
OEM
Bolt
Steering
Column Brace
#10 X 1/2”
Sheet Metal
Screw
Driver Side
Defrost Duct
ASM
496086
Passenger Side
Defrost Duct
ASM
496087
Cowl
Def Duct
Figure 6
Driver Side OEM
Astro Vent Passenger Side
OEM Astro Vent
Astro Vent
Cap
496097
(3) S-Clip
65980-VUE
Astro Vent
Cap
496097
Install
(2) S-clips
Drvr/Pass Louver
Hose Adapter
496105

10
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 10 OF 24
1/4-20 X 1 1/2”
Bolt w/
Washer
Fresh Air Cover Installation
Silicone
Fresh Air
Cap
(4) Grommets
33137-VUI
Figure 7
Back Side
of Fresh Air
Cap
Engine
Compartment
Side Of
Firewall
Install 7/8” plug in OEM hole on firewall (See Figure 7, below).
Install (4) grommets in fresh air cap (See Figure 7, below).
Apply a 1/4” bead of silicone around the back side of the fresh air cap as shown in Figure 7, below.
Attach fresh air cap to firewall using a 1/4-20 X 1 1/2" bolt and washer (See Figure 7, below) . Note: Fresh
air cap installs on engine side of firewall.
1.
2.
3.
4.
7/8” Plug
33142-VUI
Figure 8b
Figure 8a
Figure 8
Kick Panel Fresh Air Cap Installation
Install (4) grommets in kick panel fresh air cap (See Figure 8a, below).
Route A/C and heater hose through fresh air cap and kick panel fresh air cap
as shown in Figures 8 and 8b, below.
Apply a 1/4” bead of silicone around the back side of the kick panel fresh air
cap as shown in Figure 8a, below.
Secure kick panel fresh air cap to kick panel using (5) #8 x 1 1/4 PH pan
head screws, as shown in Figure 8b, below.
1.
2.
3.
4.
(5) #8 X 1 1/4
PH Pan Head
Screws
181076
Silicone
Back Side of
Kick Panel
Fresh Air Cap
#10 A/C
Hose #6 A/C
Hose
(2)Heater
Hoses
#10 A/C
Hose
#6 A/C
Hose
(2) Heater
Hose
(4)Grommet
s
33137-VUI

11
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 11 OF 24
Evaporator Installation
On a workbench, install (2) heater fittings
with properly lubricated O-rings (See
Figure 15, Page 14, and Figure 11, Page
12).
Install evaporator front & rear mounting
brackets on evaporator using
(6)1/4-20 X 1/2” hex bolts, and tighten
as shown in Figure 10, below, & Figure
11, Page 12.
Lay evaporator sub case on passenger
side floorboard. Install A/C & heater hose
on evaporator as shown in Figure 15,
Page 14, and Figure 12, Page 13.
NOTE: Wrap the #10 fitting connections
with press tape. See Figure 12,
Page 13.
1.
2.
3. (2)1/4-20 X 1/2
”
Hex Bolt
Front
Evaporator
Bracket
644100
Figure 10
Firewall Cover Installation
Apply a 1/4” bead of silicone
around the back side of the
firewall cover as shown in Figure
9, below.
From inside the car, install firewall
cover on firewall using:
(3) 1/4-20 X 1” hex bolts,
(3) flat washers, and
(1) 1/4-20 nut with star washer
(See figure 9, below).
NOTE: Use seam sealer or
silicone to fill gap between
cover and lip in firewall
before painting.
1.
2.
Back Side
of Firewall
CoverSilicone
(3) 1/4-20 X 1”
Hex Bolt
1/4” Nut
w/ Star Washer
Firewall
Cover
644109
Holes
Not Used
(3) 1/4 X 3/4
Flat Washer
1/4 X 3/4
Flat Washer
Figure 9

12
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 12 OF 24
Rear
Evaporator
Bracket
ASM
644107
(2) Heater
Fittings
(2) 1/4-20 X ½”
Hex Bolt
(2) 1/4-20 X ½”
Hex Bolt
Bracket Installation (Cont.)
Figure 11
70-72 CUTLASS
MOUNTING
HOLES

13
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 13 OF 24
Figure 12
Figure 13
#10 A/C
Hose
Hose
Clamps
Heater
Hose
#6 A/C
Hose
Press
Tape
Kick Panel
Fresh Air
Cap
Drill 3/16” Holes in
Cowl After Leveling
(2) #14 X 3/
4
Hex Sheet
Metal Screw
Evaporator Installation (Cont.)
Lift evaporator unit up under the dashboard. Secure loosely to the firewall from the engine compartment side
using (2) 1/4-20 x 1 1/4” hex bolts and flat washers (See Figure 13, below).
Verify that evaporator unit is level and square to the dash.
Secure the front evaporator mounting bracket to the cowl. Using the bracket as a template, drill (2) 3/16”
holes in the cowl. Secure with (2) #14 x 3/4” hex sheet metal screws (See Figure 13, below).
Tighten all mounting bolts. NOTE: Tighten the bolt on the firewall first. Then tighten the front
mounting bracket.
1.
2.
3.
4.
(2) 1/4-20 X 1 1/4”
Hex Bolt
182899
(2) 1/4”
Flat Washer
18125-VUB
70-72 CUTLASS
MOUNTING
HOLES

14
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 14 OF 24
Lubricating O-rings
Figure 15
Locate evaporator drain on bottom of evaporator
case.
In line with drain, lightly make a mark on the
firewall. Measure 1” down and 2 1/2” to the left,
and drill a 5/8” hole through the firewall (See
Figure 14, right).
Install drain hose to bottom of evaporator unit
and route through firewall (See Figure 14, right).
1.
2.
3.
Drain Hose Installation
Figure 14
Evaporator
O-ring
O-ring, Installs
Over Male Insert
To Swaged Lip
Supplied Oil
For O-rings
Female
Nut
Male
Insert
O-ring
#6 O-ring
#8 O-ring #10 O-ring Twist With
This Wrench
Hold With
This Wrench
For a proper seal of fittings: Install
supplied O-rings as shown, and
lubricate with supplied oil.
Case
1”
2 1/2”
Drain
Hose
1”
2 1/2”
Locate the #8 compressor A/C hose. Lubricate (2) #8 O-rings (See Figure 15, above) and connect the 45°
female fitting with R134a service port to the #8 discharge port on the compressor. Route the 90° female fitting
to the #8 condenser hardline coming through the core support. See Figure 16, Page 15. Tighten each fitting
connection as shown in Figure 15, above.
Locate the #10 compressor A/C hose. Lubricate (2) #10 O-rings (See Figure 15, above) and connect the
#10 135° female fitting with R134a service port to the #10 suction port on the compressor. Route the 90°
female fitting to the #10 evaporator (See Figure 12, Page 13, and Figure 16, Page 15). Tighten each fitting
connection as shown in Figure 15, above.
Locate the #6 evaporator A/C hose. Lubricate (2) #6 O-rings (See Figure 15 , above) and connect the 90°
female fitting to the #6 hardline coming through the core support from the drier. Route the 90° female fitting
to the #6 evaporator (See Figure 12, Page 13, and Figure 16, Page 15). Tighten each fitting connection as
shown in Figure 15, above.
1.
2.
3.
1.
A/C Hose Installation
Standard Hose Kit:
Refer to separate instructions included with modified hose kit.
Modified A/C Hose Kit:

15
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 15 OF 24
A/C & Heater Hose Routing
From Htr Cntrl Valv
e
To Evaporator
Figure 16
Heater
Hose
FROM EVAPORATOR
TO WATER PUMP
(4) Tie Wraps
#6 Drier/Core
Hardline
091180
#6 Hose
096066
Heater Hose &
Heater Control Valve Installation
Route a piece of heater hose from the water pump to the top heater fitting of heater core as shown in Figure
12, Page 13, and Figure 16, below. Secure using hose clamps. NOTE: OEM water pump outlet is 3/4”.
A 3/4” x 5/8” reducer fitting is required (not supplied).
Route a piece of heater hose from the intake to the bottom heater fitting of heater core as shown in Figure 12,
Page 13, and Figure 16, below. Install heater control valve in line with intake manifold (pressure side) heater
hose, and secure using hose clamps as shown in Figure 16, below. NOTE: Proper flow direction.
1.
2.
F
R
OMI
NT
AK
E
MANIFOLD
NOTE: OEM Water Pump Outlet Is 3/4“. A 3/4” x 5/8”
Reducer Fitting Is Required (Not Supplied).
Heater Hose
(Heater Cntrl
Valve/Intake)
Compressor
Safety Switch
(Binary Type)
Screw-on Drier
(Refer To
Condenser
Instructions)
#10 Suction
Hose
096079
#8 Discharge
Hose
096078
#8 Condenser/
Comp Hardline
091179

16
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 16 OF 24
Install duct hoses as shown in Figures 19 and 20, Page 17.
Install 3/8” grommet.
Route A/C wires through 3/8” grommet as shown in Figure 17, below (12 volt/ground/binary switch/heater
valve).
Install control panel assembly.
Plug the wiring harnesses into the ECU module on the sub case as shown in Figure 20, Page 17 (Wire
according to wiring diagram on Pages 18 and 19).
Reinstall all previously removed items (Battery tray, battery, inner fender and radiator).
Install U-nuts in glove box top/bottom (See Figure 18, below).
Install glove box bottom in glove box compartment using OEM screws.
Install glove box top using (4) S-clips and OEM screws (See Figure 18, below).
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 fittings, brackets and belts for tightness.
Vintage Air recommends that all A/C systems be serviced by a certified automotive air conditioning
technician.
Evacuate the system for a minimum of 45 minutes prior to charging. Check for leaks prior to servicing.
Charge the system to the capacities stated on the information page (Page 4) of this instruction manual.
See Operation of Controls procedures on Page 20.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
Final Steps
Figure 17 Figure 18
Grommet
33145-VUI
(4) S-clips
(2) U-nut #8
189801
Glove Box
Top
496077
Glove Box
Bottom
496078
OEM
Screws

17
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 17 OF 24
From
Controls
Figure 19
Control Panel &
Duct Hose Routing
Route passenger side duct hose as shown below.
Tie wrap duct hose to dash brace for glove box arm clearance.
1.
2.
Tie
Wrap
Dash
Brace
Glove Box
Arm
Pass. Side
Louver
2 1/2” X 45”
Center Driver
Side Louver
2 1/2” X 28”
Driver Side
Louver
2 1/2” X 26”
Center Pass.
Side Louver
2 1/2” X 15”
Figure 20
Plug
From
Wiring
Harness
232001-VUR
Pass. Side
Def. Duct
2” X 13”
Driver Side
Def. Duct
2” X 30”
Plug
From
Control
Wiring
Harness
232002-VUA

18
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 18 OF 24
WHT/GRN
WHT/YEL
WHT/RED
RED
WHT
BACKLIGHT NEG
FAN WIPER
MODE WIPER
TEMP WIPER
5V-SW
GND
BACKLIGHT POS
AC ANNUNCIATOR
PRE-WIRED
GEN IV WIRING DIAGRAM
REV C, 11/24/2009
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 Under the Hood in the Engine Compartment
and As Close to the Battery As Possible.
Wide Open Throttle Switch Contacts Close Only at Full Throttle, Which Disables A/C
Compressor.
JF8
BLK
ORA
TAN
VIEWED FROM WIRE SIDE
•
•
•

19
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 19 OF 24
RED
CIRCUIT BREAKER
30 AMP
+
+
-
BLACK
RED
WHITE
RED
CHASSIS
GROUND
HEATER
CONTROL
VALVE
A/C
COMPRESSOR
RELAY HEATER
CONTROL
VALVE RELAY
Ignition Switch:
Dash Light:
NOTE:
MOUNT RELAYS
IN DESIRED
LOCATION
UNDER DASH
GREEN
FIREWALL
BLUE
BLUE
RED
&
WHITE
VIOLET
(IGNITION HOT
TERMINAL)
IGNITION
SWITCH
DASH BACK LIGHT+0-12v
TAN
GRAY
GREEN
RED
BLUE
WHITE
WHITE
WARNING:
ALWAYS MOUNT CIRCUIT
BREAKER UNDER THE HOOD
IN THE ENGINE COMPARTMENT
AND AS CLOSE TO THE
BATTERY AS POSSIBLE
RED
RED
WHITE
COMPRESSOR
BATTERY
NOTE: CONNECT WHITE
WIRES DIRECTLY TO
(-) BATTERY TERMINAL
CONNECT
CONNECT
CONNECT
CONNECT
CONNECT
CONNECT
BAT
RUN
12V
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.
Relay:
Green Wire Is Heater Control Valve.
Blue Wire Is A/C Compressor.
Binary: Connect As Shown (Typical
Compressor Wiring). Be Sure
Compressor Body Is Grounded.
Trinary Switch: Connect According to
Trinary Switch Wiring Diagram.
Install Solenoid Pointing Down. Normal
To Get Very Hot During Operation. White
Ground Wire (Not Part of Harness)
Supplied in Kit. Normally Open Valve
Must Be Connected for Proper System
Operation.
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

20
901076 REV A 9/17/12, INST 1970-72 CUTLASS wo AC EVAP KIT PG 20 OF 24
Operation Of Controls
A/C Mode
Heat Mode
Defrost Mode
On Gen IV systems with three lever/knob controls, the temperature control toggles
between economy/heat and A/C modes. To activate A/C, move the temperature lever all
the way to COLD and then back it off to the desired vent temperature. For economy/heat
mode, move the temperature lever all the way to HOT and then adjust to the desired vent
temperature. Each time you toggle between modes, the blower will momentarily change
speed to indicate the change.
Blower Speed
Adjust to desired
speed.
Slide the lever all
the way left
for DASH mode.
Mode Lever Temperature Lever
In A/C mode, slide the
temperature lever all the
way right to engage
compressor (Slide lever
left or right to adjust
to desired temperature).
Blower Speed
Adjust to desired
speed.
Temperature Lever
Slide the temperature
lever all the way left
to the hot position
(Slide lever left or right
to desired temperature).
Slide the lever to
the center position
For FLR mode.
Mode Lever
Temperature Lever
Adjust to desired
speed.
Blower Speed
Slide the lever all
the way right
for DEF mode.
Mode Lever
Adjust lever to
desired temperature
(Compressor is
automatically
engaged).
Temperature
Lever
Blower
Speed
HOT COLD
DASH DEF FLR
OFF FAN HI
AIR CONDITIONING
AC
Mode
Lever
HOT COLD
DASH DEF FLR
OFF FAN HI
AIR CONDITIONING
AC
HOT COLD
DASH DEF FLR
OFF FAN HI
AIR CONDITIONING
AC