Question about 1994 Jeep Grand Cherokee
While the engine is running, ac switched ON to Lo, fans cranked high, compressor will not kick in, (clutch not spinning) until power is supplied to compressor from battery while engine is running. I have put 30 Oz of refrigerant into the system, what are the next trouble shooting steps?
Posted by Anonymous on
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Posted on Jan 02, 2017
Definitely sounds like its low on refrigerant. The compressor needs at least 2lbs of refrigerant to turn on. The bad news is your jeep most likely takes R-12 refrigerant which is very expensive and is no longer available over the counter but at a garage with AC recovery equipment. Checking the pressure in the line is the only way to confirm this. Best of luck to you on your problem.
Posted on May 09, 2009
Hello, You have two switches which work off the pressure of the Freon. Both of these switches cut off the power to the compressor. One is for HIGH pressure and the other is for LOW pressure. Check for power at the compressor clutch connector harness while the controls are set and the engine is running. You may have power and a bad clutch.
When you say that the Freon pressure is good, does that mean the pressure is within the proper range? Too much Freon will make the HIGH switch cut off power and too little will make the LOW pressure switch cut off power.
The ideal amount(ozs) of Freon is what is recommended by the Manufactuer and it will provide a moderate amount of pressure of about 35psi-40psi. You can borrow pressure gauges, called Manifold gauges to measure your system at autoparts stores with loaner programs.
The low pressure side of the system is the one you use to induce the Freon to go into an empty system. You can bypass this switch by taking off the connector and putting a "U" shaped jumper into the harness and the compressor clutch should get power to LOCK up all of the time.
You can take off the switch connector at the compressor clutch and then check for power when bypassing the HIGH pressure switch if the LOW pressure switch does not make the system get power. Only, really only bypass the HIGH pressure switch with the clutch connector disconnected. The HIGH switch is there to prevent damage to all of the components from seals to lines to every piece of Freon hardware in the car. Bypassing with the A/C clutch disconnected will allow you to know if power is getting to the compressor clutch.
Finally, you can get FREE wiring and fusebox diagrams through Autozone.com. Just sign and register to their site and then you can print the documents for yourself.
Good luck with this repair and I hope my solution helps you.
Posted on Mar 19, 2012
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