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Old 02-09-2014, 11:55 AM
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2005 Jeep liberty 3.7 v6

Previously the A/C sometimes was not cold and it would stumble and almost stall ( I think the compressor slugging) but temp was normal. Car overheated slightly when I was driving yesterday while working then it really went up (3/4). The fan was not working even with the key "on" and the A/C on. I was able to get some water in the fill tank and cool off. I drove it home with the heater on high (in S.E. Florida!) Fan was running when I opened the hood at home. I was an ASE mechanic but have not been active professional since '80's. I think maybe I have a bad relay causing it to overheat. I replaced the fan (1) and housing possibly 2yrs ago. I also recently replaced the water pump, thermostat/housing and also the temperature sensor, tensioner and belt. No codes only the temp light came on. I have a scanner.
I an going to replace the relay in the engine compartment and hope that's all there is to it. If there is anything else I should look at I would appreciate a response. My wife uses the car so I don't want her to get stuck somewhere. Thanks.
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Old 02-09-2014, 12:21 PM
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Re: 2005 Jeep liberty 3.7 v6

I would do a block test, the 3.7l and 4.7l engines blow head gaskets if you look at them funny, your typically doomed with a single overheat. I would figure out where the coolant went that you replaced to get it home. If there is nothing external, I would further look at a head gasket failure.

I am not positive, but IIRC most chrysler products do not run the electric fan with the engine off even with the key "on". If you think about it, what is it going to do anyway, cooling the coolant in the radiator isn't going to do anything for the engine temp without the coolant circulating.

The fact that you state you added coolant and were able to get it home, I would focus on where the coolant is going, do a block test!
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