Jeep cooling system problems

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Jeep cooling system problems

Postby steve » Thu Jun 05, 2008 8:04 am

My oldest son has a 99 grand cherokee. Last night the a/c started to blow warm air at a stop light and then the temp gauge jumped up to the red in a matter of seconds. He let the engine cool down and checked the colant level. It was full . He drove it home without the a/c and evertything was ok.However if you turn on the air it blows hot and up goes the temp gauge. Any ideas. Thansk.
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Postby minniemobuddha » Fri Jun 20, 2008 3:53 pm

it sound like a cooling fan issue,possibly with a relay or switch,or a fan motor problem.if its just when the ac is turned on it could be a relay.do you hear a belt squeal?if so the ac compressor is locked up,not allowing the belt to turn the water pump.kinda remote but the chacne is there.hope this helps
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jeep cooling system

Postby steve » Thu Jun 26, 2008 7:59 am

Thanks for the reply . You were correct on your diagnosis. The fan relay was bad as well as a relay on the air conditioning.A two for one deal. Then a couple of days later the battery shot craps. The bad battery became evildent when the truck was running rought at idle. Thanks.
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Re: Jeep cooling system problems

Postby shinnery » Wed Aug 18, 2010 1:03 am

I have a 92 Dodge D250 CTD (228k mi.) that last summer got to overheating when you used the A/C. Got to looking at it and when the A/C compressor clutch kicked in the serpentine belt STOPPED. :shock: No smoke or anything. I went and bought a new belt and tensioner. Put them both on and no more problems. I would have never thought that crank pully would spin in that serpentine belt without burning it in two.
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