B4CC connectors at HVAC box

H is the old climate control head and P is the AC programmer connector (ex. 16H is pin 16 on the climate head connector )

T10e (Pink/Red connector on HVAC box, joined with T5o)

1 Gn/P - To Data Link Connector Leave disconnected

2 Bk/Y – To MFI ECU 23H

3 W/Gn – Dome Light temp sensor 18H

4 Bk/R – AC low Pressure switch AC Relay 2/3 (join w/ wire at old connector for HVAC)

5 Br – Dashboard temp sensor fan blower ground 7H

6 W/Bl – Temp Display (Speedo feed) 2H and temp display cnnctr

7 Br/Y – Bumper temp sensor 16H

8 Bl/Bk – Dash temp sensor 4H

9 Bl/W – Coolant temp sensor 20H

10 Br/Y – Temp Display (temp value) Splice w/ temp display cnnctr

T5o (Pink/Red connector on HVAC box, joined with T10e)

1 Bl/Br – Engine coolant temp (temp sensor in heater valve) 17H

2 Br/Bk – TCM (not used on manual cars) Leave disconnected

3 Br/Bl – AC High pressure cut out 5H

4 Gr/Gn – Compressor speed (ignored with reflash of control unit) Leave disconnected

5 Gn/Bl – RPM signal Tap from instrument cluster

T6q (Red connector on HVAC box)

1 Gr/Gn – lights? 13H

2 Bk/Gr – To MFI ECU 4/87a on AC relay (cut wire and join w/ wire no longer connected to relay)

3 Br/Bk – To low speed relay 3P

4 Br/W – Ground for sensor inputs 6H

5 R/Bl – To digital clock + 12H

6 Gn/Br – AC Relay control Join w/ AC relay 6/31 (cut 6/31 wire and join w/ end attached to relay still)

T3c (Brown connector on HVAC box)

Plug in to existing harness plug

T5l (Yellow connector for temp display, behind instrument cluster)

1 W/Bl – Speedo feed Join w/ T10e/6 and 2h

2 Br/Y – Temp value Join w/ T10e/10

3 Br - Ground Ground at ground post

4 Gr/Bl – Illumination Splice with wire on T3c

5 Bk/Bl - + Feed from + yellow block at relay panel

T2at (Black connector on HVAC box)

1 Bl/Y – Unknown? Dead ends in B4 diagrams

Notes

Join 4P to 5P

Add a pin on D7 on B4 climate connector to control heater valve 2-way vacuum solenoid. This wire should connect to ground pin of solenoid. Tap + wire from HVAC box harness

Tap illumination for temp display off 3 pin connector.

Take 4/87a wire off relay connector and connect to cut wire(Bk/Gr) that went to 5/T on the AC relay.

Color Key

Br - Brown

Bk - Black

Bl - Blue

W - White

Y - Yellow

Gn - Green

Gr - Grey

P – Purple

R – Red

1st color is primary color/2nd color is secondary stripe (not as big as 1st color)

Parts needed:

-B4 Center console frame from auto climate car

-B4 Auto HVAC box and climate control head (might be able to use evaporator inside, but I played it safe and used my existing one in the new box)

-Outside temp display (Assuming that most auto climate cars had them installed)

*-Extra D connector to get D7 pin from for 2 way vacuum valve

*-2-way vacuum solenoid for heater valve control (this might not be necessary if you don’t mind just the flap controlling heat. I preferred to not have the extra heat in there)

#-B3 AC programmer climate control connector

#-B3 climate control head connector (take from your existing climate control head or grab one at a junkyard. Note: pins broken off the circuit board are coated to prevent shorts, sand/grind off the protective layer before soldering wires to it)

-B4 90 AC clutch relay

#If you don’t mind cutting your harness you could just forgo the plug n play bit and connect the adapter harness to your existing one in the car with butt splices or solder it straight in.

*Not necessary for a functional swap. Heat is controlled by the internal flaps in the climate box