ShadowofBob

Since my AC compressor just ate the dust I've decided to look into putting a B4 climate control system in my Coupe. The main issue I've found from reading up on it the AC compressor doesn't have the speed signal needed for the B4 CC. Does anyone know if the European compressors from a S2 would have this function? If so they'd be the perfect fit and would be much easier than trying to make the V6 ones work on a 20v. The only other solution would be to somehow have something create the correct signal based on the engines RPM for the CC.

Also if anyone has the wiring diagrams for the B4 climate controls I'd be very grateful if someone could scan them. Thanks.

UrbanAssaultAudi

Inductive sensor (4 pulses per compressor rotation)
Provides an A/C compressor speed signal; the A/C clutch control module (manually controlled A/C) or A/C control head (automatic climate control) compares A/C compressor speed to engine speed, calculates belt slippage (percentage) and switches the A/C compressor off if slippage is too large (if, for example, the belt is too loose)

UrbanAssaultAudi

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<b>COMPONENTS</b>

E87 = A/C Control Head
F118 = A/C Refrigerant High Pressure Switch
J44 = A/C Clutch Relay
N25 = A/C Clutch
V42 = Fan For Interior Temperature Sensor
G89 = Fresh Air intake Duct Temperature Sensor
E20 = Instrument Panel Light Dimmer Switch
G56 = Interior Temperature Sensor, in instrument panel
G86 = Interior Temperature Sensor, in Headliner
G106 = Outside Air Temperature Display
G17 = Outside Air Temperature Sensor
J201 = Protection Diode
G21 = Speedometer

<b>CONNECTORS</b>

T1n = Wire Connector, single green, near compressor
T2t = Wire Connector, double, brown, behind instrument panel, left
T2u = Wire Connector, double, red, behind instrument panel, left
T3c = Wire Connector, 3 Point, brown, behind instrument panel, center
T5g = Wire Connector, 5 Point, green, connector station in auxiliary relay panel
T5l = Wire Connector, 5 Point, yellow, on instrument cluster
T5o = Wire Connector, 5 Point, red, behind instrument panel, center
T6q = Wire Connector, 6 Point, red, behind instrument panel, center
T10e = Wire Connector, 10 Point, red, behind instrument panel, center
T26 = Wire Connector, 26 Point, yellow, on instrument cluster
T26a = Wire Connector, 26 Point, blue, on instrument cluster

<b>GROUNDS CONNECTION</b>

<b>NOTE:</b> Grounds connections are indicated on the diagram by a numeric code inside a circle.

29 - Ground connection, near compressor
112 - Ground connection -2-, in A/C wiring harness
199 - Ground connection -2-, in instrument panel wiring harness

<b>HARNESS SPLICES</b>

NOTE: Harness splices are points inside a wiring harness where two or more wires are crimped and/or soldered together. Harness splices are indicated on the diagrams by an alphanumeric code inside a circle.

A19 - Wire connection (58d), in instrument panel wiring harness
A27 - Wire connection (speed signal), in instrument panel wiring harness
A34 - Wire connection (75x), in instrument panel wiring harness
L2 - Wire connection, in A/C wiring harness

UrbanAssaultAudi

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<b>COMPONENTS</b>

E87 = A/C Control Head
V71 = Air Flow Flap Motor
G113 = Back Pressure Flap Motor Potentiometer
G112 = Central Flap Motor Potentiometer
V70 = Central Air Flap Motor
G114 = Footwell , Defrost Flap Motor Potentiometer
V85 = Footwell I Defrosted Flap Motor
G5 = Tachometer
G92 = Temperature Regulator Flap Motor Potentiometer
V68 = Temperature Regulator Flap Motor

<b>CONNECTORS</b>

T1m = Wire Connector, single, red, behind instrument panel, left
T3c = Wire Connector, 3 Point, brown, behind instrument panel, center
T5o = Wire Connector, 5 Point, red, behind instrument panel center
T6q = Wire Connector, 6 Point, behind instrument panel, center
T26 = Wire Connector, 26 Point, yellow, on instrument cluster

<b>GROUNDS CONNECTION</b>

<b>NOTE:</b> Grounds connections are indicated on the diagram by a numeric code inside a circle.

81 - Ground connection -1-, in instrument panel wiring harness
97 - Ground connection -1-, in A/C wiring harness
112 - Ground connection -2-, in A/C wiring harness
188 - Ground connection -3-, in A/C wiring harness

<b>HARNESS SPLICES</b>

<b>NOTE:</b> Harness splices are points inside a wiring harness where two or more wires are crimped and/or soldered together. Harness splices are indicated on the diagrams by an alphanumeric code inside a circle.

A45 - Wire connection (RPM signal), in instrument panel wiring harness
L31 - Wire connection ( 5 Volts), in A/C wiring harness

UrbanAssaultAudi

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<b>COMPONENTS</b>

E87 = A/C Control Head
F73 = A/C Refrigerant Low Pressure Switch
Y2 = Digital Clock
F76 = Engine Coolant Temperature (ECT) Electronic Thermoswitch
J126 = Fresh Air Blower Control Module
N63 = Fresh Air , Recirculating Flap Two-Way Valve
V2 = Fresh Air Blower
E1 = Light Switch
J192 = MFI Engine Control Module (ECM)
G5 = Tachometer
K - Wire Distributer For Data Link Connector(DLC); Terminal K

<b>CONNECTORS</b>

T2z = Wire Connector, double, white, in Plenum, Near Relay Panel (Data Link Connector)
T2at = Wire Connector, double, black, behind instrument panel, center
T3c = Wire Connector, 3 Point, brown, behind instrument panel, center
T5h = Wire Connector, 5 Point, red, behind instrument panel, left
T5o = Wire Connector, 5 Point, red, behind instrument panel, center
T6q = Wire Connector, 6 Point, red, behind instrument panel, center
T10e = Wire Connector, 10 Point, red, behind instrument panel, center
T26 = Wire Connector, 26 Point, yellow, on instrument cluster

<b>GROUNDS CONNECTION</b>

NOTE: Grounds connections are indicated on the diagram by a numeric code inside a circle.

97 - Ground connection -1-, in A/C wiring harness

<b>HARNESS SPLICES</b>

NOTE: Harness splices are points inside a wiring harness where two or more wires are crimped and/or soldered together. Harness splices are indicated on the diagrams by an alphanumeric code inside a circle.

A3 - Plus connection (58), in instrument panel wiring harness
A20 - Wire connection (15a), in instrument panel wiring harness
A23 - Wire connection (30al), in instrument panel wiring harness
A45 - Wire connection (RPM signal), in instrument panel wiring harness
L4 - Wire connection (75al), in A/C wiring harness
L6 - Wire connection -1-, in A/C wiring harness

UrbanAssaultAudi

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<b>COMPONENT</b>

F23 = A/C Refrigerant High Pressure Switch
G111 = A/C Compressor Speed Sensor
F18 = Coolant Fan Control (FC) Thermoswitch
F54 = Coolant Fan Control (FC) Thermoswitch
J26 = Coolant Fan Control (FC) Relay
N39 = Coolant Fan Control (FC) Series Resistance
V7 = Coolant Fan
S42 = Fuse For Coolant Fan, in Adapter B
J101 = Second Speed Coolant Fan Control (FC) Relay

<b>CONNECTORS</b>

T2am = Wire Connector, double. green, near compressor
T6u = Wire Connector, 6 Point, green, behind instrument panel, left

<b>GROUNDS CONNECTION</b>

NOTE: Grounds connections are indicated on the diagram by a numeric code inside a circle.

11 - Ground connection, in battery box
32 - Ground connection behind instrument panel, left
127 - Ground connection -1-, in A/C compressor wiring harness

<b>HARNESS SPLICES</b>

NOTE: Harness splices are points inside a wiring harness where two or more wires are crimped and/or soldered together. Harness splices are indicated on the diagrams by an alphanumeric code inside a circle.

L1 - Plus connection (75), in A/C wiring harness

ShadowofBob

Thanks for all those scans. Do you have one of the index page that lists what each of the letter/number codes mean?

UrbanAssaultAudi

circle what you're after and I'll see what I can come up with. alldata is limited on info

ShadowofBob

I'm looking for pretty much everything. I've used AllData in the past for some AC info for a Volvo. Isn't there an index page that lists what each thing stands for?

UrbanAssaultAudi

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<b>1 - Kick down switch
Not installed on all vehicles
Disengages A/C compressor
Can also be controlled by Transmission Control Module (TCM) or Engine Control Module (ECM)
2 - Connector station
3 - Footwell/defroster flap motor -V85-
With position sensor -G114-
4 - A/C control head -E87-
5 - Fresh air blower -V2-
6 - Control module for fresh air blower -J126-
7 - Interior temperature sensor fan -V42-
8 - Instrument panel interior temperature sensor -G56-
9 - Outside air temperature display -G106-
Not installed on all vehicles
10 - Temperature regulator flap motor -V68-
With temperature regulator flap motor position sensor -G92-</b>
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<b>11 - Central air flap motor -V70-
With central flap motor position sensor -G112-
12 - A/C refrigerant low pressure switch -F73-
13 - Evaporator housing and heater box
14 - Fresh air intake duct temperature sensor -G89-
15 - Fresh air/recirculating flap vacuum motor
16 - Fresh air/recirculating flap two-way valve
17 - Headliner interior temperature sensor -G86-</b>