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help with cherokee AC not fully working

ariff on Tue August 02, 2011 6:38 PM User is offline

Year: 2001
Make: Jeep
Model: Cherokee
Engine Size: 4.0
Refrigerant Type: 134a
Ambient Temp: 110
Pressure Low: 35
Pressure High: 250
Country of Origin: United States

Hello everyone,
I am having issues with a 2001 Cherokee. I have had issues with the AC ever since I have owned it about 2 yrs. It just kinda works. For example today in KS it is freaking hot around 110 degrees. My AC was not working for crap. I got home and put my gauges on to see what was up. I am a bit of a newbie with AC systems so I'll do my best to describe the results. Static pressure was 95 on the low side and 98 on the high. With car running and AC on recirc and full low press was 35 and high was 250. Now when I rev'd the engine the low pressure would drop to around 20 psi high to around 275 and the low pressure switch would cut out the AC clutch. With the compressor off low press would rise to about 80 high press drops to around 200. Then at idle all returns to normal around 35 on the low side and 250 on high. If I jump the low press switch the AC clutch never turns off. temp at the condenser was around 112 and vent temp was around 80. I replaced the compressor, accumlator and line last summer. Then had a shop flush and charge the system. It has never cooled properly in my opinion. This has been very frustrating to troubleshoot.. Been over a year and I still can't get it cooling like I think it should. I have taken it to a few mechanics and they don't seem to ever get it working properly. Any suggestions out there? Another thing I noticed is the low press lines and accumulator don't seem to sweat or get very cold.

Edited: Tue August 02, 2011 at 6:40 PM by ariff

Dougflas on Tue August 02, 2011 8:22 PM User is offline

Testing conditions: rpm 1500
Max /rec air
windows open at your listed ambient, you appear to be under charged. System should not cycle at 110* ambient. Recover and weigh correct charge into system by weight.

bohica2xo on Wed August 03, 2011 3:01 AM User is offline

Is this vehicle equipped with the electric fan, or a belt drive fan? They used both types on that model year...


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~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

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