Vintage Air 551170 User manual

1969-70 FORD MUSTANG
WITHOUT FACTORY AIR
551170
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INST PG 1 OF 26
an ISO 9001:2015 Registered Company
18865 Goll St. San Antonio, TX 78266
Phone: [phone]
Sales: [email protected]
Tech Support: [email protected]
www.vintageair.com

2
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INST PG 2 OF 26
PAGES
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COVER
TABLE OF CONTENTS
PACKING LIST/ PARTS DISCLAIMER
INFORMATION PAGE
WIRING NOTICE
ENGINE COMPARTMENT / PASSENGER COMPARTMENT
FIGURES 1 & 2
DEFROST DUCT / FRESH AIR CAP & DRIVER AND PASSENGER SIDE
LOUVER INSTALLATION
FIGURES 3 & 4, 4a
EVAPORATOR INSTALLATION
FIGURES 5,5a & 6
FIREWALL COVER INSTALLATION
FIGURES 7 & 7a
CENTER LOUVER INSTALLATION
FIGURES 8 & 8a
DRAIN HOSE INSTALLATION & LUBRICATING O-RINGS, STANDARD HOSE KIT
& MODIFIED A/C HOSE KIT
FIGURES 9 & 10
HEATER HOSE & HEATER CONTROL VALVE INSTALLATION
FIGURE 11
A/C & HEATER HOSE ROUTING
FIGURE 12
FINAL STEPS & GLOVE BOX INSTALLATION
FIGURES 13 & 13a
DUCT HOSE ROUTING
FIGURE 14
EVAPORATOR HARD LINE AND BRACKET INSTALLATION
FIGURE 15
WIRING DIAGRAM
OPERATION OF CONTROLS.
TROUBLE SHOOTING
TROUBLE SHOOTING CONT.
DRIVER SIDE LOUVER TEMPLATE
PASSENGER SIDE LOUVER TEMPLATE
CENTER LOUVER TEMPLATE
FIREWALL COVER HOLE TEMPLATE
EVAPORATOR KIT PACKING LIST
GEN IV WIRING CONNECTION INSTRUCTIONS
Table of Contents

3
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INST PG 3 OF 26
F
A
N
DASH
FLR
DEF
HOT
COLD
** 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,
VINTAGE AIR WILL NOT BE RESPONSIBLE FOR MISSING OR DAMAGED ITEMS.
EVAPORATOR KIT
551170
1.
2.
1
1
744004-VUE
781069
GEN IV 4-VENT EVAPORATOR SUB CASE with 204 ECU
1969-70 MUSTANG without A/C GEN IV ACCESSORY KIT
NO. QTY. PART NO. DESCRIPTION
EVAPORATOR KIT PACKING LIST
1
2
GEN IV 4-VENT
EVAPORATOR SUB CASE
with 204 ECU
744004-VUE
ACCESSORY KIT
781069 NOTE: IMA GES MAY NOT DEPICT ACTUAL PARTS AND QUANTITIES.
REFER TO PACKING LIST FOR ACTUAL PARTS AND QUANTITIES.

4
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INST PG 4 OF 26
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. (28.8 oz.) or 816 grams 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.

5
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INST PG 5 OF 26
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.
•
•
•

6
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INST PG 6 OF 26
BATTERY (RETAIN).
DRAIN RADIATOR
OEM HEATER HOSES (DISCARD).
ENGINE COMPARTMENT
REMOVE THE FOLLOWING:
BEFORE STARTING THE INSTALLATION, CHECK THE FUNCTION
OF THE VEHICLE (HORN, LIGHTS, ETC.) FOR PROPER OPERATIONS.
STUDY THE INSTRUCTIONS, ILLUSTRATIONS & DIAGRAMS.
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.
CONDENSER ASSEMBLY & INSTALLATION
COMPRESSOR & BRACKETS
NOTE: REMOVAL OF THE DASHBOARD IS REQUIRED TO INSTALL THE EVAPORATOR. VINTAGE AIR
RECOMMENDS THAT YOU UTILIZE THE FACTORY SERVICE MANUAL WHEN YOU DISASSEMBLE
AND REASSEMBLE THE DASHBOARD.
REMOVE THE DASH PAD, INSTRUMENT PANEL, PASSENGER SIDE PANEL AND LOWER PASSENGER SIDE
DASHBOARD (RETAIN SCREWS) (SEE FIGURE 1, BELOW).
GLOVE BOX (DISCARD) (SEE FIGURE 1, BELOW). NOTE: THE GLOVE BOX WILL NOT FIT WITH THE
EVAPORATOR UNIT INSTALLED. A WITH FACTORY AIR VEHICLE AFTERMARKET GLOVE BOX WILL
NEED TO BE PURCHARSED.
HEATER ASSEMBLY AND ALL RELATED DUCTING (DISCARD) (RETAIN SCREWS) (SEE FIGURE 2, BELOW).
CONTROL PANEL ASSEMBLY (RETAIN CONTROL PANEL) (SEE FIGURE 1, BELOW).
REFER TO THE CONTROL PANEL CONVERSION KIT INSTRUCTIONS FOR INSTALLATION OF THE CONTROLS.
REMOVE THE OEM DEFROST DUCT ASSEMBLY (SEE FIGURE 2, BELOW).
INSTRUMENT
PANEL
CONTROL
PANEL
DEFROST DUCT
ASSEMBLY
HEATER
ASSMEBLY
FIGURE 1
FIGURE 2
DASH PAD
GLOVE
BOX
PASSENGER SIDE
PANEL
LOWER PASSENGER
SIDE DASHBOARD
PASSENGER COMPARTMENT
REMOVE THE FOLLOWING:

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901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INST PG 7 OF 26
TEMPLATE
SILICONE
DRILL 2 ¾”
HOLE
DRIVER SIDE
PASSENGER SIDE
DRILL 2 ¾”
HOLE
LOUVER
490535
LOUVER BEZEL
605181
LOUVER BRKT
642075
2 ½” HOSE
ADAPTER
DASH
TEMPLATE
DEFROST
DUCT
605169
(3) 3/16”
SAE FLAT
WASHERS
(3) OEM
STAR NUTS
DRILL
HOLES
FRESH AIR
CAP
605174
(3) 10 X 1/2”
SHEET METAL
SCREW
INSTALL DEFROST DUCT UNDER DASH AS SHOWN IN FIGURE 3 BELOW. SECURE USING OEM NUTS
w/ (3) 3/16” SAE FLAT WASHERS.
HOLD FRESH AIR CAP UNDER DASH AND MARK THE (3) MOUNTING HOLES.
DRILL (3) 1/8” MOUNTING HOLES UNDER DASH.
APPLY A 1/4” BEAD OF SILICONE AROUND THE BACK SIDE OF THE FRESH AIR CAP AS SHOWN IN
FIGURE 3, BELOW.
SECURE FRESH AIR CAP TO FRESH AIR HOLE USING (3) #10 x 1/2” SHEET METAL SCREWS AS SHOWN
IN FIGURE 3 BELOW.
CUT OUT TEMPLATE PROVIDED ON PAGE 22. PLACE THE DRIVER SIDE TEMPLATE ON THE DASH BY
ALIGNING THE LEFT SIDE OF THE TEMPLATE AGAINST THE EDGE OF THE DASH, THEN ALIGN THE
BOTTOM OF THE TEMPLATE TO BOTTOM OF DASH AS SHOWN IN FIGURE 4.
CUT OUT TEMPLATE PROVIDED ON PAGE 23. PLACE THE PASSENGER SIDE TEMPLATE ON THE DASH
BY ALIGNING THE RIGHT SIDE OF THE TEMPLATE AGAINST THE EDGE OF THE DASH, THEN ALIGN
THE BOTTOM OF THE TEMPLATE TO BOTTOM OF DASH AS SHOWN IN FIGURE 4.
ONCE TEMPLATE IS ALIGNED CORRECTLY, USE A CENTER PUNCH TO MARK THE HOLE ON THE
DASH. REMOVE TEMPLATE. USE A 2 ¾” HOLE SAW TO CUT HOLE IN DASH, SEE FIGURE 4 BELOW.
INSTALL LOUVERS IN DASH AS SHOWN IN FIGURE 4a BELOW.
FIGURE 3
FIGURE 3 FIGURE 4a
DEFROST DUCT/ FRESH AIR CAP INSTALLATION
DRIVER AND PASSENGER SIDE LOUVER INSTALLATION

8
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INST PG 8 OF 26
EVAPORATOR INSTALLATION
SBY
1969-70MUSTANG w/ o AC
FIREWALLCOVER
HOLETEMPLATE
THIS SIDE INSIDE OF CA R
(6) 3/16
HOLES
OEM HEATER
HOLE
BLOWER MOTOR
MOUNTING
HOLE
BLOWER
MOTOR
MOUNTING
HOLE
BLOWER
MOTOR
MOUNTING
HOLE
BLOWER
MOTOR
MOUNTING
HOLE
(4) ALIGNM ENT HOLES
USE TEMPLATE PROVIDED ON PAGE 25. ALIGN TEMPLATE WITH OEM BLOWER MOTOR MOUNTING
HOLES & DRILL (6) 3/16” HOLES IN FIREWALL FROM INSIDE UNDER DASH, SEE FIGURE 5a.
ON A WORK BENCH, INSTALL EVAPORATOR REAR BRACKET AND HARDLINES WITH PROPERLY LUBRICATED
O-RINGS. SEE FIGURE 10, PAGE 11 AND FIGURE 15, PAGE 16.
REMOVE 2 OEM HEATER PLUGS IN FIREWALL, SEE FIGURE 7, PAGE 9.
INSTALL FRONT MOUNTING BRACKET ON EVAPORATOR USING (2) 1/4-20 x 1/2” HEX BOLTS AND TIGHTEN
AS SHOWN IN FIGURE 5 BELOW.
LIFT EVAPORATOR UNIT UP UNDER THE DASHBOARD SEE FIGURE 6. SECURE LOOSELY TO THE FIREWALL
FROM THE ENGINE COMPARTMENT SIDE USING (2) 1/4-20 NUT AND WASHER, SEE FIGURE 6 BELOW.
USING (2) #14 x 3/4” SHEET METAL SCREWS w/ 1/4” FLAT WASHER SECURE THE FRONT EVAPORATOR
MOUNTING BRACKET TO THE INNER COWL. SEE FIGURE 6 BELOW.
VERIFY THAT EVAPORATOR UNIT IS LEVEL AND SQUARE TO THE DASH, THEN TIGHTEN ALL MOUNTING
BOLTS. (NOTE: TIGHTEN THE BOLT ON FIREWALL FIRST, THEN THE FRONT MOUNTING BRACKET SCREWS.)
EVAP FRONT
BRKT
641271
DRIVER SIDE EVAP
MOUNTING HOLE
DRIVER SIDE EVAP
MOUNTING HOLE
(2) #14 x 3/4”
SHEET METAL
SCREW
w/ 1/4”
FLAT WASHER
PASSENGER SIDE EVAP
MOUNTING HOLE
PASSENGER SIDE EVAP
MOUNTING HOLE
OEM HEATER
LINE HOLES
FIGURE 5
FIGURE 5a
FIGURE 6

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901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INST PG 9 OF 26
SILICONE
FIREWALL
COVER
642071
(6) #14 X 3/4”
SHEET METAL
SCREWS
GROMMET
33144-VUI
GROMMET
33137-VUI
GROMMET
33135-VUI
OEM
HOLES
OEM
HEATER HOLE
IN FIREWALL
OEM HEATER
LINE HOLES
(REMOVE PLUG)
(4) OEM
BLOWER MOTOR
MOUNTING HOLES
INSTALL (3) GROMMETS ON FIREWALL COVER AS SHOWN IN FIGURE 7, BELOW.
APPLY A 1/4” BEAD OF SILICONE AROUND THE BACK SIDE OF THE FIREWALL COVER AS SHOWN IN
FIGURE 7a, BELOW.
SECURE FIREWALL COVER TO FIREWALL USING (6) #14 x 3/4” SHEET METAL SCREWS, SEE FIGURE 7,
BELOW. (NOTE: FIREWALL COVER INSTALLS ON ENGINE SIDE OF FIREWALL.)
FIREWALL COVER INSTALLTION
ENGINE
COMPARTMENT
SIDE OF
FIREWALL
FIGURE 7a
FIGURE 7

10
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INST PG 10 OF 26
ASSEMBLED VIEW
INSTALL UNDER DASH LOUVERS USING (3) #8 x 1/2” PAN HEAD SCREWS.
TEMPLATE
CUT OUT
CENTER LOUVER
ASM
590070
UNDER DASH
LOUVER
CUT OUT CENTER LOUVER TEMPLATE PROVIDED ON PAGE 24. ALIGN CENTER LOUVER TEMPLATE ON DASH
PAD AS SHOWN IN FIGURE 8a.
MARK CENTER LOUVER OPENING ON DASH PAD. ONCE
CENTER LOUVER OPENING IS MARKED REMOVE TEMPLATE
AND CAREFULLY CUT OUT OPENING IN DASH PAD.
INSTALL CENTER LOUVER ASM AS SHOWN IN FIGURE 8.
CENTER LOUVER INSTALLATION (OPTION 1)
UNDER DASH CENTER LOUVER INSTALLATION (OPTION 2)
FIGURE 8a
FIGURE 8

11
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INST PG 11 OF 26
LOCATE EVAPORATOR DRAIN ON BOTTOM OF EVAPORATOR CASE.
IN-LINE WITH THE DRAIN, LIGHTLY MAKE A MARK ON
THE FIREWALL. MEASURE ONE INCH DOWN AND DRILL
A 5/8” HOLE THROUGH THE FIREWALL. SEE FIGURE 9.
INSTALL DRAIN HOSE TO BOTTOM OF EVAPORATOR
UNIT AND ROUTE THROUGH FIREWALL.
SEE FIGURE 9.
DRAIN HOSE INSTALLATION
DRAIN FIGURE 9
DRAIN
HOSE
1”
LUBRICATING O-RINGS
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.
FEMALE
NUT
MALE
INSERT
SUPPLIED OIL
FOR O-RINGS
#6 O-RING
#8 O-RING #10 O-RING
FIGURE 10
O-RING,
SLIDE OVER
MALE INSERT TO
SWAGED LIP
O-RING
O-RING
STANDARD HOSE KIT
MODIFIED A/C HOSE KIT
LOCATE THE #8 COMPRESSOR A/C HOSE. LUBRICATE (2) #8 O-RINGS (SEE FIGURE 10, ABOVE) AND CONNECT
THE 45°FITTING TO THE #8 DISCHARGE PORT ON THE COMPRESSOR. ROUTE THE STR FEMALE w/ 134a
SERVICE PORT FITTING TO THE #8 CONDENSER HARDLINE COMING THROUGH THE RADIATOR CORE SUPPORT.
SEE FIGURE 12, PAGE 13. TIGHTEN EACH FITTING CONNECTION AS SHOWN IN FIGURE 10 ABOVE.
LOCATE THE #10 COMPRESSOR A/C HOSE. LUBRICATE (2) #10 O-RINGS AND CONNECT THE 90°FEMALE
w/ 134a SERVICE PORT FITTING TO THE #10 SUCTION PORT ON THE COMPRESSOR, ROUTE THE 135°FEMALE
FITTING TO THE #10 EVAPORATOR HARDLINE COMING THROUGH THE FIREWALL. SEE FIGURES 11, PAGE 12 &
FIGURE 12, PAGE 13. TIGHTEN EACH FITTING CONNECTION AS SHOWN IN FIGURE 10 ABOVE.
(NOTE: WRAP THE #10 FITTING CONNECTIONS WITH PRESS TAPE. SEE FIGURE 11, PAGE 12 & FIGURE 12,
PAGE 13.)
LOCATE THE #6 EVAP/DRIER A/C HOSE. LUBRICATE (2) #6 O-RINGS AND CONNECT THE STR FEMALE FITTING
TO THE #6 DRIER HARDLINE COMING THROUGH THE RADIATOR CORE SUPPORT. ROUTE THE 90°FEMALE
FITTING TO THE #6 EVAPORATOR HARDLINE COMING THROUGH THE FIREWALL. SEE FIGURES 11, PAGE 12 &
FIGURE 12, PAGE 13. TIGHTEN EACH FITTING CONNECTION AS SHOWN IN FIGURE 10, ABOVE.
USE (6) TIE WRAPS TO SECURE THE #6 A/C HOSE TO THE EXPORT BRACE AS SHOWN IN FIGURE 12, PAGE 13.
REFER TO SEPARATE INSTRUCTIONS INCLUDED WITH MODIFIED HOSE KIT.

12
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INST PG 12 OF 26
HEATER HOSE & HEATER CONTROL VALVE INSTALLATION
ROUTE A PIECE OF HEATER HOSE FROM THE WATER PUMP TO THE HEATER LINE COMING THROUGH THE FIREWALL
AS SHOWN IN FIGURE 11, BELOW. SECURE USING HOSE CLAMPS.
ROUTE A PIECE OF HEATER HOSE FROM THE INTAKE TO THE HEATER LINE COMING THROUGH THE FIREWALL
AS SHOWN IN FIGURE 11 BELOW. NOTE: INSTALL HEATER CONTROL VALVE IN-LINE WITH INTAKE MANIFOLD
(PRESSURE SIDE) HEATER HOSE, SECURE USING HOSE CLAMPS AS SHOWN IN FIGURE 11 BELOW.
(NOTE PROPER FLOW DIRECTION.)
FIREWALL
COVER
642071 #6 A/C HOSE
#10 SUCTION
HOSE
O-RINGS
PRESS
TAPE FIREWALL
ECU
MODULE
#10 SUCTION
LINE (INSULATED)
EXPANSION
VALVE
FIGURE 11
FROM EVAPORATOR
TO WATER PUMP
FROM INTAKE
MANIFOLD
FROM HTR CNTRL VLV
TO EVAPORATOR
HEATER
HOSE

13
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INSTR PG 13 OF 26
OUT
IN
AC & HEATER HOSE ROUTING
NOTE: VINTAGE AIR SYSTEMS REQUIRE (2) 5/8 HOSE NIPPLES (NOT SUPPLIED)
#10
SUCTION
HOSE
(6) TIE
WRAP
HEATER HOSE
(HEATER CNTRL
VALVE/ INTAKE)
#8
DISCHARGE
HOSE
INNER
FENDERWELL
#8 CONDENSER TO
CORE SUPPORT
HARDLINE
081096
#6 DRIER TO
CORE SUPPORT
HARDLINE
081095
COMPRESSOR
SAFETY SWITCH
(BINARY TYPE)
SCREW ON DRIER
(REFER TO
CONDENSER
INSTRUCTIONS)
CORE
SUPPRORT
FIGURE 12
PRESS
TAPE
HEATER HOSE
(HEATER CORE/
WATER PUMP)
#6
HOSE

14
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INST PG 14 OF 26
GLOVE BOX
INSTALL DUCT HOSES AS SHOWN IN FIGURE 14, PAGE 15.
ROUTE A/C WIRES THROUGH 3/8” GROMMET AS SHOWN IN FIGURE 13a
(12 VOLT/ GROUND/ BINARY SWITCH/ HEATER VALVE).
INSTALL CONTROL PANEL ASM.
PLUG THE WIRING HARNESS IN THE ECU MODULE ON SUB CASE AS SHOWN IN FIGURE 14, PAGE 15
(WIRE ACCORDING TO WIRING DIAGRAM ON PAGE 17 AND 18)
GLOVE BOX INSTALLATION (SEE FIGURE 13)
REINSTALL ALL PREVIOUSLY REMOVED ITEMS (BATTERY).
FILL RADIATOR WITH AT LEAST A 50/50 MIXTURE OF APPROVED ANTIFREEZE AND DISTILLED WATER.
IT IS THE OWNERS RESPONSIBILTY 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 AC MODE AND/ OR
FREEZING WEATHER, VOIDING YOUR WARRANTY.
DOUBLE CHECK ALL FITTING, BRACKETS AND BELTS FOR TIGHTNESS.
VINTAGE AIR RECOMMENDS THAT ALL AC SYSTEMS BE SERVICED BY A CERTIFIED AUTOMOTIVE AIR
CONDITIONING TECHNICIAN.
EVACUATE THE SYSTEM FOR A MINIMUM OF 45 MINUTES PRIOR RO CHARGING AND LEAK CHECK
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 PAGE 19.
INSTALL GLOVE BOX WITH OEM SCREWS. SEE FIGURE 13.
FIGURE 13
FIGURE 13a
FIREWALL
COVER
FINAL STEPS
GLOVE BOX INSTALLATION
GROMMET

15
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INST PG 15 OF 26
DUCT HOSE ROUTING
SB Y
DRIVER SIDE
DEF. DUCT
2” x 14”
DRIVER SIDE
LOUVER
2 ½” x 30”
CENTER LOUVER
DRIVER SIDE
2 ½” x 32”
CENTER LOUVER
PASS. SIDE
2 ½” x 32”
PASS. SIDE
DEF. DUCT
2” x 12”
PASS. SIDE
LOUVER
2 ½” x 32” PLUG
FROM
CONTROL
WIRING
HARNESS
232002-VUA
PLUG
FROM
WIRING
HARNESS
232600-VUA
CONTROL PANEL
HARNESS TO ECU
FIGURE 14

16
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INSTR PG 16 OF 26
1/4” PUSH NUT
BOLT RETAINER
189125-MUR
1/4-20 X 1”
COARSE BOLT
18289-VUB
BRACKET
#6
LIQUID LINE
081091
EVAPORATOR HARD
LINE INSTALLATION
HEATER LINE
(EVAP TO WATER PUMP)
081094
NOTE: AFTER INSTALLING
#10 SUCTION LINE
WRAP ALL EXPOSED METAL
FITTINGS & TUBE
WITH SUPPLIED
PRESS TAPE.
PRESS TAPE
F
HOLD WITH
THIS WRENCH
1/4-20 X 1/2”
BOLT
(LOCATED ON
SUB CASE)
TWIST WITH
THIS
WRENCH
#10 O-RING
33859-VUF
HEATER LINE
(EVAP TO INTAKE)
081093
ECU MODULE
LUBRICATE O-RING
(SEE FIGURE 10,
PAGE 11.)
#10 SUCTION
LINE
081092
#6
O-RING
33857-VUF
PASS SIDE EVAP
REAR BRKT
641272
DRIVER SIDE EVAP
REAR BRKT
641273
#10 O-RING
33859-VUF
FIGURE 16

17
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INST PG 17 OF 26
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 E, 10/6/2017
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

18
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INST PG 18 OF 26
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.

19
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INST PG 19 OF 26
FLR
FLR
DASH
DASH
COLD
COLD
F
A
N
F
A
N
DEF
DEF
HOT
HOT
FLR
DASH
COLD
F
A
N
DEF
HOT
OPERATION OF CONTROLS
BLOWER SPEED A/C THERMOSTAT LEVER
MODE LEVER
A/C MODE
MODE
LEVER
BLOWER
SPEED
THERMOSTAT
LEVER
HEAT MODE DEFROST/ DE-FOG MODE
THIS LEVER CONTROLS
THE BLOWER SPEED,
FROM OFF TO HI
SLIDE THE LEVER TO
THE DASH POSITION
IN A/C MODE SLIDE THE
THERMOSTAT LEVER ALL THE
WAY LEFT TO THE COLD POISTION,
TO ENGAGE COMPRESSOR
FOR MAXIMUM COOLING
(SLIDE LEVER LEFT OR RIGHT TO
ADJUSTDESIRED TEMPERATURE)
NOTE: WHEN BATTERY POWER IS FIRST CONNECTED TO THE ECU, THE COMPUTER GOES THROUGH AN
INITIALIZATION SEQUENCE. THIS INITIALIZATION MAY TAKE UP TO 30 SECONDS. DURING INITIALIZATION
THE BLOWER WILL NOT OPERATE, BUT THE DOORS INSIDE THE UNIT WILL BE OPERATING. A LOW BATTERY
OR DISCONNECTING THE BATTERY MAY ALSO TRIGGER A RE-INITIALIZATION. DURING START UP, A LOW
BATTERY MAY DROP BELOW 7 VOLTS, TRIGGERING RE-INITIALIZATION.
BLOWER SPEED
SLIDE LEVER UP TO
DESIRED BLOWER SPEED,
FROM OFF TO HI
BLOWER SPEED
SLIDE LEVER UP TO
DESIRED BLOWER SPEED,
FROM OFF TO HI
MODE LEVER
SLIDE THE LEVER TO
THE DEF POSITION
A/C THERMOSTAT LEVER
MODE LEVER
SLIDE THE LEVER TO
THE FLR POSITION
IN HEAT MODE SLIDE THE
THERMOSTAT LEVER ALL
THE WAY RIGHT TO THE
HOT POISTION, FOR
MAXIMUM HEATING.
(SLIDE LEVER LEFT OR
RIGHT TO ADJUST DESIRED
TEMPERATURE)
A/C THERMOSTAT LEVER
IN DEF MODE SLIDE THE
THERMOSTAT LEVER ALL
THE WAY LEFT TO THE
COLD POISTION TO
ENGAGE COMPRESSOR.
FOR MAXIMUM COOLING.
(SLIDE LEVER LEFT OR RIGHT
TO ADJUST DESIRED
TEMPERATURE)

20
901271 REV G 02/04/19, 1969-70 MUSTANG wo AC EVAP INSTR PG 20 OF 26
Symptom Condition Checks Actions Notes
Blower stays on high speed when ignition is on.
1a.
No other functions work.
Check for damaged pins or wires in control head plug. Verify that all pins are inserted into plug. Ensure that no
pins are bent or damaged in ECU.
Check for damaged ground wire (white) in control head harness.
Verify continuity to chassis ground with white control head wire at various points.
Loss of ground on this wire renders control head inoperable.
All other functions work. Check for damaged blower
switch or potentiometer and associated wiring.
Blower stays on high speed when ignition is on or off.
Unplug 3-wire BSC control connector from ECU. If blower shuts off, ECU is either improperly wired or damaged.
Be sure the small, 20 GA white ground wire is connected to the battery ground post. If it is, replace the ECU.
Unplug 3-wire BSC control connector from ECU. If blower stays running, BSC is either improperly wired or damaged.
Check to ensure that no BSC wiring is damaged or shorted to vehicle ground. The BSC operates the blower by ground side pulse width modulation switching. The positive wire to the blower will always be hot. If the “ground” side of the blower is shorted to chassis ground, the blower will run on HI. Replace BSC (This will require removal of evaporator from vehicle). No other part replacements
should be necessary.
Compressor will not turn on (All other functions work).
2.
System is not charged. System must be charged for
compressor to engage. Charge system or bypass pressure switch.
Danger: Never bypass safety switch with engine running. Serious injury can result.
System is charged.
1b.
Troubleshooting Guide
Check for faulty A/C potentiometer or associated wiring (Not applicable to 3-pot controls).
Check for disconnected or faulty thermistor.
Check continuity to ground on white control head wire. Check for 5V on red control head wire.
Check 2-pin connector at ECU housing.
To check for proper pot function, check voltage at white/blue wire. Voltage should be between 0V and 5V, and will vary with pot lever position. Disconnected or faulty thermistor will cause compressor to be disabled. Red wire at A/C pot should have approximately 5V with ignition on. White wire will have continuity to chassis ground. White/ Blue wire should vary between 0V and 5V when lever is moved up or down.
3.
Compressor will not turn off (All other functions work).
Check for faulty A/C potentiometer or associated wiring. Check for faulty A/C relay.
Repair or replace pot/control wiring.
Replace relay.
See blower switch check procedure.