AC not working

Miggy #23 RF · January 29th, 2012, 08:45 PM

I know its winter and its not needed but i want to get it done before the cali heat ges here. Anyways, the car is 98 GT and the problem is the ac clutch dont but I know it works because I have wired it directly. I have tried jumping the cycling and assuming I did that correctly I still didnt get clutch engagment. I would like any ideas about troubleshooting what is wrong. Thanks for any help given.

97S281 · January 30th, 2012, 08:34 PM

Check the refrigerant pressure. If the pressure is low it will not come on.

Miggy #23 RF · January 31st, 2012, 11:24 AM

I thought that with jumping the cycling switch the system should cycle even it is low on refrigerant

soupnutz · February 1st, 2012, 12:14 PM

Had the same problem. I troubleshot it down to the (just forgot the name of it), but the relay box inside the passenger side wheel well. Wound up just bypassing it and running the wires from the pressure switches straight to the compressor. All the relay does is cut power to it when you go WOT. Been a couple of years and no problems.

Miggy #23 RF · February 1st, 2012, 04:36 PM

Do you know what wires you jumped so I can try that? Btw do you if by passing that relay also bypasses the safety features built into the system?

soupnutz · February 2nd, 2012, 02:25 PM

What safety features are you referring to? Been a while since I looked at the schematic, but it only went through a WOT controlled relay. I suppose it's possible to overpressure the system if you go WOT with the A/C turned on, but it also goes through two pressure switches, a low and high, so the high pressure switch should kill it (if it's in working condition). As far as the wires, I don't remember exactly. The power goes through the control panel, then to the two switches, to the CCRM, then to the compressor. Cant remember which switch is the second one in line, but I cut the wire coming out of it, (going to the CCRM) and soldered in a piece of wire between there and the compressor power input wire. No need to mess with the ground wire, (assuming it's good), it goes from the compresser to wherever it's grounded at. When/if I ever fix/ or replace the CCRM it's just a matter of reconnecting the original wires.

Miggy #23 RF · February 10th, 2012, 03:40 PM

Got it fixed by doing what Soup said

January 29th, 2012, 08:45 PM	#1
Miggy #23 RF Newbie Join Date: Mar 2008 Posts: 11 iTrader: 0 reviews	AC not working I know its winter and its not needed but i want to get it done before the cali heat ges here. Anyways, the car is 98 GT and the problem is the ac clutch dont but I know it works because I have wired it directly. I have tried jumping the cycling and assuming I did that correctly I still didnt get clutch engagment. I would like any ideas about troubleshooting what is wrong. Thanks for any help given.

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January 30th, 2012, 08:34 PM	#2
97S281 Rollin' 18/ pushin' 2 1997 Saleen S281 Join Date: Feb 2007 Location: The lost highway Posts: 6,673 iTrader: 13 reviews	Check the refrigerant pressure. If the pressure is low it will not come on. __________________ MODS IN GARAGE NCMM ORIGINAL BLOWN 96-98 CREW MEMBER # 1

January 31st, 2012, 11:24 AM	#3
Miggy #23 RF Newbie Join Date: Mar 2008 Posts: 11 iTrader: 0 reviews	I thought that with jumping the cycling switch the system should cycle even it is low on refrigerant

February 1st, 2012, 12:14 PM	#4
soupnutz Regular 1998 GT; 01 330i Join Date: Jul 2010 Location: Virginia Beach, VA Posts: 73 iTrader: 0 reviews	Had the same problem. I troubleshot it down to the (just forgot the name of it), but the relay box inside the passenger side wheel well. Wound up just bypassing it and running the wires from the pressure switches straight to the compressor. All the relay does is cut power to it when you go WOT. Been a couple of years and no problems.

February 1st, 2012, 04:36 PM	#5
Miggy #23 RF Newbie Join Date: Mar 2008 Posts: 11 iTrader: 0 reviews	Do you know what wires you jumped so I can try that? Btw do you if by passing that relay also bypasses the safety features built into the system?

February 2nd, 2012, 02:25 PM	#6
soupnutz Regular 1998 GT; 01 330i Join Date: Jul 2010 Location: Virginia Beach, VA Posts: 73 iTrader: 0 reviews	What safety features are you referring to? Been a while since I looked at the schematic, but it only went through a WOT controlled relay. I suppose it's possible to overpressure the system if you go WOT with the A/C turned on, but it also goes through two pressure switches, a low and high, so the high pressure switch should kill it (if it's in working condition). As far as the wires, I don't remember exactly. The power goes through the control panel, then to the two switches, to the CCRM, then to the compressor. Cant remember which switch is the second one in line, but I cut the wire coming out of it, (going to the CCRM) and soldered in a piece of wire between there and the compressor power input wire. No need to mess with the ground wire, (assuming it's good), it goes from the compresser to wherever it's grounded at. When/if I ever fix/ or replace the CCRM it's just a matter of reconnecting the original wires.

February 10th, 2012, 03:40 PM	#7
Miggy #23 RF Newbie Join Date: Mar 2008 Posts: 11 iTrader: 0 reviews	Got it fixed by doing what Soup said

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