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Unread 08-01-2009, 11:47 PM   #1
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1998 XJ Cherokee 
Join Date: Jul 2008
Location: Maine
Posts: 262
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.

1996 Jeep Cherokee Sport. 3" lift/31" combo. Some lights. Flowmaster. 5 different horns. Full size spare. No rust. Daily driven. Will be...forever.
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Unread 08-02-2009, 12:54 AM   #2
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2014 MK Patriot 
Join Date: Jul 2008
Location: Belgrade,MT
Posts: 164
if its the head gasket your oil/coolant will look "milky".my bet would be fan clutch
2014 Patriot Latitude
2006 GMC Sierra 1500,reg.cab, short box,4x4,mostly stockTraded in
1994 ZJ 2" BB,31" TrXus MT-sold and have regretted it ever since :(
2002 Subaru Impreza 2.5RS w/ too much to list here
1994 Toyota 4Runner-I couldn't destroy it but the rust was making good progress-Traded in.
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Unread 08-02-2009, 03:40 PM   #3
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1997 ZJ 
Join Date: Dec 2006
Location: , Pennsylvania
Posts: 19,793
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.
'97 zj 5.2, some stuff, some other suff, and some things that even work sometimes.

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