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Old 07-08-2003, 10:04 AM   #1
2yLiTe
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Member#: 660
Join Date: Dec 1999
Location: Windsor, Ontario CANADA
Default Anyone have an AirCon wiring diagram?

for a GC8?

Picture the AC compressor...

there are two connectors on top; one large, one small.
The large connector has three wires, one of which comes out and becomes the second connector (single wire), that single wire is supposed to supply 12V. hard wiring it to the POS on the battery turns the compressor on... but when it is connected normally it won't come on. Question... where does that single wire connect to?

ok, kinda confusing... I guess I'll need the wiring diagram.... sigh.
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Old 07-08-2003, 10:13 AM   #2
Mulder
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Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
Vehicle:
02 WRX
15 WRX/05 GTO

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Before you go crazy with electrical troubleshooting, have the refrigerant charge in the system checked. The most common cause of the compressor not coming on is low system pressure due to a leak, there is a low-pressure cutout switch that disables the compressor to protect it from running with insufficient charge.
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Old 07-08-2003, 10:21 AM   #3
2yLiTe
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Location: Windsor, Ontario CANADA
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gotcha...

The car was brought to a licensed AC technician, system checks out fine.... here's the play by play.

technician connects his equipment to the car, does the whole Vacuum, and recovery and leak thing...

it fills half way... at this point he tells me to start the car and fire up the AC... the compressor doesn't start.

He begins troubleshooting... he connects a wire to the single wire connector on the compressor directly to the POS on the battery... the compressor starts turning..and it accepts the remainder of the refrigerant. Problem is with that single wire (I think it's the compressor clutch wire)

NOTE: I recently had an STi ver7 implant, hence my request for a wiring diagram.

after doing a search, I found that there are indeed a total of 3 wires that connect to the compressor... one of which is for the ECU, (my suspicion)

If this were a track only car, then I wouldn't be too concerned, but it's my daily driver... so creature comforts are kinda high on the list if you know what I mean.
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Old 07-08-2003, 11:27 AM   #4
Mulder
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Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
Vehicle:
02 WRX
15 WRX/05 GTO

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Ok, now I see the situation. The compressor is actually operated by a relay controlled from the ECU, when you turn on the AC switch it is actually asking the ECU to turn the AC on. If your car was originally set up the same way you can just connect the existing wires to it, otherwise you can bypass the whole ECU thing and wire the switch to turn on the compressor directly (through a relay). However if you do the latter it will run all the time, you won't have functions such as compressor cutout at WOT or high engine temps, etc.
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Old 07-08-2003, 11:58 AM   #5
2yLiTe
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Join Date: Dec 1999
Location: Windsor, Ontario CANADA
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I suspect something isn't connected... I'm gonna go check out the car..

How many connectors are there? I know of 2 on top of the compressor...

and there are some by the "can" on the passenger side...

I've been told that there is a connector under the brake booster... gonna check to make sure those are all connected.

any tips, tricks, advice... please reply.
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Old 07-08-2003, 10:41 PM   #6
PARANOID56
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Member#: 22035
Join Date: Jul 2002
Chapter/Region: SCIC
Location: San Diego, CA
Vehicle:
2003 Brocoma DCab
71 FJ40, 13 DRZ400SM

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well here is the wiring diagram for a 2000 rs. I hope this helps, sorry they are so big
Shane

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