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Unread 08-13-2012, 08:49 PM   #1
Concolour
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New to ZJ and i have a wee problem with overheating.

Ok. so i just bought this 94 grand cherokee limited with the 5.2 a month ago. and just this week it started overheating. first i noticed that there was coolant bubbling out of the overflow, usually after shutting it off. and yes, it was still boiling in the reservoir. but other than that just that it will come up to temp really fast and eventually up to the redline while at any speed including just idling.... it's been a long long time since i've done anything cooling related. there's no leaks that i can detect, just from the cap of the reservoir. the fan is indeed working, and the rad isn't blocked/bent fins. this leaves me with three things that i can think of. a clog, water pump, or thermostat. or even a combo of all three. are there any symptoms that would show for any of those so i know what part to order and replace/fix? would like this fixed asap as its currently the DD.

thanks for any and all help

-Puma

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Unread 08-14-2012, 12:18 AM   #2
KennzX
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Get a new cap, burp the system. Should be good after that.

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Unread 08-14-2012, 12:43 AM   #3
Concolour
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Quote:
Originally Posted by KennzX View Post
Get a new cap, burp the system. Should be good after that.

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actually just tried that..... it didn't work. not sure why when it should have given what i've seen is wrong. but. i'll try reburping the system and go from there.

anything else i could try?
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Unread 08-14-2012, 05:58 AM   #4
Texas ZJ1
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Cap? With the motorat idle at operating temp, touch the upper and lower hoses. Is either hose "cold"? Have you flushed the radiator? Changed the thermostat or waterpump?

Hunter
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Unread 08-14-2012, 10:55 AM   #5
Concolour
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Quote:
Originally Posted by Texas ZJ1 View Post
Cap? With the motorat idle at operating temp, touch the upper and lower hoses. Is either hose "cold"? Have you flushed the radiator? Changed the thermostat or waterpump?

Hunter
I'll try that when I get home. Thermostat and wp will have To wait for parts
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Unread 08-15-2012, 06:07 PM   #6
Concolour
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alright ^.^ went and checked it out. let it heat up and lo and behold? thermostat was stuck closed XD so swapped that out, or rather, one of the tech's at work did and if anything it runs a bit cold now X3 thanks for all the suggestions. especially hunter, who practically diagnosed it from his desktop. i'm sure the rad cap was also a culprit in this case too, so thank you too, KennzX!
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