Question about 1993 Jeep Grand Cherokee

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Ac stop running if engine temperature is high

My problem of my jeep GC is the aircon run only on cold engine once i reach temperature of 105 the ac compressor is not run,i check the fuse,relay and switch all of this ok,i just put the temporary solution by installing separate relay to supply the battery to ac compressor but everytime the temperature of my engine is getting high i switch off the ac and let the temperature go down manually switch on the ac,i know this is abnormal can u please advice. thanks and waiting ur good advice.
leoS

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Your question is a bit hard to follow but I think I understand it. First I believe you are saying that the engine temp gets high at 105f, I think you mean 205f..that is not too high actually but sounds as if the compressor is adding a load to your engine. You need to check the compressor out and it is not an easy task to do. But a simple test is.
ENGINE IS NOT RUNNING!!..sorry just want to be clear, with the engine off and cool, the center part of the compressor operates from a clutch , try to turn it with your hand to see how hard it turns, not real fast you are just feeling the bearings at this point. If it is real hard to turn you should have that looked at but if it is not real hard you may have either a low oil charge or low freon condition in the ac system, local parts stores have a refill kit to check this out, get the one with the coloured guage on it, it will allow you to fill to the proper level. Boy I hope this helps you, ac probs are the worst to fix without seeing it.
If your engine is getting real hot like the 220f region you might want to check your radiator fluid (coolant level and condition) as well as the thermostat, the 6 cyl uses one around 195f . I don't know the 8 cyl one buy you can check the temp of the hoses to see if the thermostat is working properly.
good luck!

Posted on Aug 10, 2008

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