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Jeep A/C question

[email protected] on Tue May 04, 2010 8:24 PM User is offline

Year: 1999
Make: Jeep
Model: Cherokee
Engine Size: 4.0
Refrigerant Type: 134a
Ambient Temp: ?
Pressure Low: ?
Pressure High: ?

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.

Chick on Tue May 04, 2010 8:34 PM User is offlineView users profile

You will need both the high and low side pressures.. I'll bet it was humid day, you could possibly have a low charge..But the compressor not coming back on could be a wide clutch gap, and other possibility..pressures would be the first step along with the ambient temp they are taken at, and also when the compressor stops and does not come back can try using a hammer handle and tap the clutch inwards, being careful of the belts, and if that make it come back on, a clutch gap issue is likely...

Email: Chick


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