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MUSTANGGT1998 on Tue May 27, 2008 10:02 PM User is offline

Year: 1998
Model: GT
Engine Size: V8
Refrigerant Type: R134A

Helllo all. I just invested in a complete and I mean complete new a/c system from my 1998 mustang gt. Replaced the compressor, the filter dryer, the condenser coil and replaced all the "o" rings. A/C works great when started cold and also runs good during the initial start up. Once the car sits idle after driving - then if you turn the a/c on the a/c will not work once the car is hot. I noticed also that once the car sits idle and the a/c switch inside the car is turned on, the electric fan does not seem to engage during that command. The hi and low pressure switches are fine. The freon level is right on the money. The fan does work once the car reaches it's temperature. I also noticed that this a/c system cycles allot when operating while the old system did not. What could this possibly be??

MUSTANGGT1998 on Tue May 27, 2008 10:07 PM User is offline

Sorry one more thing - Does anyone know where I could obtain a copy of the complete a/c system diagram for the 1998 mustang GT?

mk378 on Tue May 27, 2008 10:44 PM User is offline

Does the compressor engage when you push the button and it is hot? If not check if it will pull in when you tap on the clutch plate, be very careful of moving parts. The clutch gap may be too wide.

It could be one of those cars where the fans are pressure activated, the fan normally don't start unless the compressor is running.

MUSTANGGT1998 on Wed May 28, 2008 7:07 AM User is offline

The compressor is brand new so shouldnt the clutch plate gap be factory set? Is there another sensor somewhere that may not be working like a fan sensor? And if the gap on the clutch plate is not proper then why only when the car is cold does it run properly and not all the time. Boy this really has me pissed....

mk378 on Wed May 28, 2008 10:07 AM User is offline

When cold, the clutch coil has less electrical resistance. Thus a higher current flows and the magnetic force is stronger and can overcome a larger gap. Gap should have been factory set but not everything that comes out of a factory is perfect.

MUSTANGGT1998 on Wed May 28, 2008 9:39 PM User is offline

o.k. Guys here what I have found out - the 1998 mustang contains an A/C Control Module located behind the fender wall of the passenger side of the car. I will engage the inside switch to power on the A/C and if the clutch module is not getting energized then the only remaining thing is the module.
I will keep everyone posted once I trouble shoot this after work tomarrow. By the way the part can only be obtained from the dealer at a cost of $ 175.00 so now I will be up to 1,500 to have a/c. Here in FL having A/C has no price

Chick on Wed May 28, 2008 10:13 PM User is offlineView users profile

Is the below pic the module you are talking about? If so it's the CCRM and controls a few different things, and they do fail..They are also repairable, the cold solder spot on the AC relay can burn..Let us know if thats it, and we can supply a repair procedure..Hope this helps..

Email: Chick


Freedoms just another word for nothing left to lose

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