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Unread 08-01-2009, 10:47 PM   #1
KevinM90
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1998 XJ Cherokee 
 
Join Date: Jul 2008
Location: Maine
Posts: 263
Overheating at idle..

Motor is a 5.2 v8
So about a month back my water pump went, pissing anti freeze all over the place. I replaced that and it worked fine for about 3 weeks. Then It started running very hot again, so first I tried the thermostat. That didn't do too much. Then this past week I was pulling in to work and it was running about 220 degees, so i parked as soon as possible, and at that point anti freeze was blowing out everywhere again. I replaced the radiator, and its been alright since, but it seems like if I drive for a while, then stop to go do something with the truck idling, the temps start to get high. If i am running and moving, it is fine.
I tried searching but the most I could come up with was to replace a fan relay, and I dont have an electric fan, just the belt fan. The only thing left I could think of was a fan clutch? Is there anything else I should be looking for here? I know a bad head gasket will lead to overheating, but It runs cool and fine when moving, so I think I ruled that out, but not sure. Sorry if Im vague, its late at night and Ive had a long day dealing with it.

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Unread 08-01-2009, 11:54 PM   #2
Subie-Jeep
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2014 MK Patriot 
 
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if its the head gasket your oil/coolant will look "milky".my bet would be fan clutch
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Unread 08-02-2009, 02:40 PM   #3
ratmonkey
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fan clutch has failed.

run the motor up to temp then shut it off and watch how much longer the fan spins after the motor stops. if it spins more than three times the clutch is shot. ideally it shouldn't spin any more after the motor stops when it's up to temp.
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