dstef1605

So today, while driving the Jeep home from work, I decided that because it was so hot, that I would turn the a/c on so that I could cool the car down. Everything seemed to work as expected, except, I noticed when I stopped at a couple of traffic lights, the aux. fan seemed to be running the whole time that I was sitting still. This is not my first Cherokee with the 4.0L, so I know from past experience, that typically when you stop at a traffic light with the a/c on, that the aux. fan cycles on and off with the engaging of the compressor clutch. On my Jeep, it seems that the compressor clutch is not disengaging to cycle the compressor off. My drive home from work is not more than 5 miles and takes roughly 10 minutes in traffic, so I am not sure if the evaporator core is freezing up, but if I were to give it a good guess, I would almost be sure that it is, due to popping the hood when I got home, and looking at the refrigerant lines. The low pressure line was cold and the high pressure line was hot, but the low pressure line was so cold, that the condensate forming on them was beginning to freeze to the metal line. I have posted seveal times before trying to figure out what would be causing the compressor clutch to not reengage after the engine is hot and the system had been on, but now I am beginning to wonder if my problem may be faulty pressure switch. I have tried jumpering the switches to see if the compressor clutch would engage, but that did not make it kick on. I am thinking that maybe one of the pressure switches is sticking after the system comes on or is that even possible? Any help is greatly appreciated, before I have to take it to an a/c shop and pay out the butt to get it fixxed.

Hommersimpson

without gauges hooked up... you will never dignose it properly....no mater how you look at it.... it could be as simple as the exspansion block.... to a pluged dryer... to low on freon...condenser fins coverd in mud...
A/C is the one thing that cost money pretty much just looking at it..

truckntractorhick

yea, the a/c is the only thing ill take to a shop

4.3L XJ

I agree with the gauges being on it. But I would also venture to guess you might be a little low on refrigerant.