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Jeep poor cooling

fire753 on Mon August 01, 2011 11:25 PM User is offline

Year: 1996
Make: Jeep
Model: Grand Cherokee
Engine Size: 5.2
Refrigerant Type: r134
Ambient Temp: 90

I have a 96 Jeep Grand Cherokee that is poor at cooling. Due to a slow leak, 2 years ago I recharged the system with a self help kit that had a sealer. The ac worked normal for 2 years, but now it is not cooling. I charged it again to what I thought was full. I have 100 psi static pressure when the compressor is not running. I have low pressure range of 25-43 as per specs of the low side switch, with compressor cycling on then off about every 5 seconds. I have gauges for R12 but have yet to find an adapter so I can connect my gauges to a R134 system, so not sure what the high side pressure is at. When the vehicle sits in the direct sun, I can not tell a difference in temp of the air coming from vent verses ambient temp. What I find odd is the low side line coming from the condenser to the firewall is cold to the touch but the line from the firewall to the dryer then to the compressor is like ambient temp. In most systems the dryer would also be cold. With out having gauges for the high side, I am not sure if its just low on freon or if I have a plugged dryer, or something else going on. Any input is appreciated.

JJM on Mon August 01, 2011 11:58 PM User is offline

Kit did it's job. Typically, these model year Jeeps suffer from evaporator leaks. The evap is not a fun job and it's certainly temping to use sealer, but that short term fix (which actually lasted longer than most) comes with a very expensive price: A total system replacement... everything has to go, compressor, condenser, dryer, evaporator, TXV, O-rings, and all the lines. Site sponsor has everything you need.

You also need a full gauge set for a proper diagnosis.

The cold liquid line is a telltale sign the system is seriously plugged up. Don't think there's better news here.


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