jimmy-d Posted March 11, 2011 Report Posted March 11, 2011 Does anyone have a wiring diagram for a ae82 4 door sedan 4a/c single cam 1.6? My a/c compressor is not getting power to operate so I'm wondering where it is switched from!If I run a positive direct from the battery it works fine so the problem is definitely in the switching of the power supply. The a/c button and the economy button both have power to them as they light up fine when the fan is on so I'm wondering where else to look!Only other option seems to be to wire in a bypass switch direct from dash to compressor with positive supply but I would prefer to have it work properly if possible. Any and all help appreciated.Thanks. Quote
Trev Posted March 11, 2011 Report Posted March 11, 2011 On the a/c line near the battery is a pressure switch, if there is not enough gas in the system then the pump will be on open circuit, you can jump these 2 pins to see if the clutch engages, if it does then you will need to get a re-gas and leak detection. Quote
clubby2084 Posted March 11, 2011 Report Posted March 11, 2011 My A/C was working fine one day, then not at all the next. There was no drop off in performance, it just stopped. My compressor was leaking, no gas left, no working compressor. Do what Trev said, get it regassed and tested. Then decide what you want to do from there. Be warned, to convert my A/C to R134a gas + new compressor + bits a pieces = $1200. Quote
jimmy-d Posted March 11, 2011 Author Report Posted March 11, 2011 Thanks guys,I'll check out the pressure switch today.$1200 to update a/c system says a lot for opening the window but not really the same is it!I think there is a place around here somewhere that can still recharge old systems so I will look into what alternatives and options there are.Thanks again,always good to have people in the know at the touch of a keyboard.. Quote
carbonboy Posted March 11, 2011 Report Posted March 11, 2011 Just be sure that the place thats doing the re-gassing is using the correct refrigerant gas. What type of gas has changed over the years & may not be compatible with existing pumps, compressors etc. But if first you don't find, keep hunting. Good luck! P.S I binned my A/C for the weight saving, now I have 4/80 A/C, open 4 windows & drive at 80km/hr :laff: Quote
jimmy-d Posted March 12, 2011 Author Report Posted March 12, 2011 Good news and bad news,I think! I found the soleniod I think you were talking about,half way between the battery and the firewall on the small diameter pipe,I disconnected and shorted the plug,the compressor still did not work but the radiator fans stopped.I say this is good news for the fans because they had both been running continuously whenever the car was going and never stopped,now they cycle on and off like I expect they are meant to but the compressor is still not engaging unless,as I said earlier,I run a positive supply to it from the battery bypassing all the other wiring.Any ideas?? Quote
Trev Posted March 12, 2011 Report Posted March 12, 2011 Good news and bad news,I think! I found the soleniod I think you were talking about,half way between the battery and the firewall on the small diameter pipe,I disconnected and shorted the plug,the compressor still did not work but the radiator fans stopped.I say this is good news for the fans because they had both been running continuously whenever the car was going and never stopped,now they cycle on and off like I expect they are meant to but the compressor is still not engaging unless,as I said earlier,I run a positive supply to it from the battery bypassing all the other wiring.Any ideas?? Did you have the a/c switched on in the car? If the fans run all the time with the pressure switch connected then it is low on gas. Quote
jimmy-d Posted March 12, 2011 Author Report Posted March 12, 2011 yes,a/c was on in car but as I said,although fans had been running full time now they are not, just cycling on/off and comp still not going.Am going to do some more checks,will get back if I come up with anything but I guess gas must def. be low. Quote
Trev Posted March 12, 2011 Report Posted March 12, 2011 Stupid question but I have to ask, was the cabin fan on? Quote
jimmy-d Posted March 12, 2011 Author Report Posted March 12, 2011 yes,cabin fan on,temp switch slid down to cool,car running,radiator fans cycling on and off when car has warmed up,a/c button pushed in to on position(tried this with economy button also) but no action from compressor.Maybe there is another low pressure sensor somewhere and I will just have to get it gased and see or maybe there is another wiring problem,will continue to check it out but can't afford to get it gased if its going to cost $1200 so will wait and see.Thanks Trev and all others for assistance.. Quote
Trev Posted March 12, 2011 Report Posted March 12, 2011 (edited) yes,cabin fan on,temp switch slid down to cool,car running,radiator fans cycling on and off when car has warmed up,a/c button pushed in to on position(tried this with economy button also) but no action from compressor.Maybe there is another low pressure sensor somewhere and I will just have to get it gased and see or maybe there is another wiring problem,will continue to check it out but can't afford to get it gased if its going to cost $1200 so will wait and see.Thanks Trev and all others for assistance.. Well unplug the single wire that runs to the compressor and see if it has 12v going to it when the switch pins are jumped if it does then put a 12v positive signal into the compressor, if it still doesn't work then the electromagnet is most likely dead. Edited March 12, 2011 by Trev Quote
jimmy-d Posted March 12, 2011 Author Report Posted March 12, 2011 Well I'm getting no where quickly,so to recap so far- My compressor does work because if I put a 12v supply to it with the car running,the solenoid will pull in and the compressor will rotate. With the car running,the fan switched on,the heat selector to cool,to a/c button pushed in- If I unplug the wiring at the valve behind the battery and bridge out the plug there is still no positive supply to the wire that feeds the compressor at the connector plug near the compressor,this only appears to affect the operation of the fans so obviously what ever or where ever this wire that connects to the compressor originates from it is getting no supply,faulty connection,broken wire,dashboard switches??? Maybe it will all come down to a question of line pressure for the refrigerant but I'm stumped and it seems like a reasonable assumption that what ever i do,if there is not enough refrigerant in the system it wont work anyway so thanks but I guess I will just have to wait till I can afford to gas it,thank god Melbourne weather has not been too bad so far.. Quote
Trev Posted March 12, 2011 Report Posted March 12, 2011 Has to be a stuffed relay or blown fuse, I no longer have my 82 wiring diagrams but check the fuse box in behind the battery, the front section is for the a/c. Quote
carbonboy Posted March 13, 2011 Report Posted March 13, 2011 Heya jimmy-d, just out of curiosity, what year is your AE82? I've got a manual with wiring diagrams but theres two lots, cars from 1985-87 & cars from 1988 onwards. Will see how I go managing to upload some shots here, hope they can help Quote
carbonboy Posted March 13, 2011 Report Posted March 13, 2011 Typical 1987 & earlier wiring diagram for A/C, cooler & heater Typical 1988 & later wiring diagram for A/C, cooler & heater Hope this helps! Quote
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