90 supra AC question. Please help

[BlueRolex007]

Ok guys i have tried to search and look for the solution online, but I cant find what im looking for. My question is I am trying to repair my AC system in my 90 MK3 turbo. But I cant find the wire that goes to my AC compressor. Can somebody tell me where it is located? Body loom? engine harness loom? Please keep in mind that I bought this car in pieces about a year ago and it was all hacked up when i bought it, so the AC compressor wire coulda been snipped or something. Please help :1zhelp:

 

[jetjock]

AC clutch relay location:

http://www.cygnusx1.net/Supra/Library/TEWD/MK3/manual.aspx?S=Main&P=014

 

[easternguy2005]

Pretty simple circuit. I never could get the compressor to come on with the ac button. Replaced modules and even three controllers where you press the buttons. routed a wire from the cutoff sensor and the relay to a on off switch and never looked back again. Spent over 5 months getting parts. Took it to a shop and the ac specialist said he couldnt fix it.
3 dollar later now I hit the switch which is stock looking switch from another supra probably the hazard and located in the coin slot holster, and we're blowing cold ! Temp control works great too. Best part is you're just applying a ground to the pressure cutoff switch so it's not even really "hot".

My problem is unique with a new compressor and healthy converted system with proper refrigernt.

No engine rpm upkick though, i still suspect a electronic problem not worth solving on my 1990 and like I said - done and cold.

 

[jetjock]

To each his own. As you said it's a pretty simple circuit...

 

[figgie]

BlueRolex

with time.. The cable in the motor compartment is black.. with gunk. If you wipe it is blue.

But that cable is screwed on to the compressor along with a quick disconnet spade. You mean that is not there?

 

[IBoughtASupra]

Check the signal wire for the A/C going to the ECU. It is used for idle up. Nothing is controlled for the A/C by the ECU other than the idle up function.