Help solve my Jeeps over heating issue!!!
#1
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Help solve my Jeeps over heating issue!!!
I have a 2000 Grand Cherokee Laredo 4.0 it over heated n blew head gasket. The following have been replaced and it still runs hot (210-220+) I shut it off at 220 otherwise I'm not sure if it eould keep climbing in temp. But this was all replaced new head gasket, head machined, radiator, water pump, coolant temp sensor, thermostat, fan is hard wired to stay on while running, also had whole new exhaust put on so the cat isn't plugged. It runs with less power then it should my other 4.0 jeep has wayyy more ***** and stays at a steady 180 temp. If you have any ideas lemme know!
#2
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Year: 2004
Model: Grand Cherokee
Engine: 4.0
I have a 2000 Grand Cherokee Laredo 4.0 it over heated n blew head gasket. The following have been replaced and it still runs hot (210-220+) I shut it off at 220 otherwise I'm not sure if it eould keep climbing in temp. But this was all replaced new head gasket, head machined, radiator, water pump, coolant temp sensor, thermostat, fan is hard wired to stay on while running, also had whole new exhaust put on so the cat isn't plugged. It runs with less power then it should my other 4.0 jeep has wayyy more ***** and stays at a steady 180 temp. If you have any ideas lemme know!
I agree you got an issue, if the fan's hard wired, it shouldn't get much hotter than the t-stat open temp. If you've got hot air blowing off the radiator and heat inside, it sounds like its circulating good. How long does it take the system to build pressure? As I understand it, your model year has a bad habit of cracking cylinder heads, was that checked when you had it machined? If you immediately have pressure on the cooling system after a cold start, you have a compression leak. If it's bad, you could leave the rad cap off, start the engine, and it'll immediately spit coolant out of the radiator, maybe with some distance, too.
Cool air over radiator above 195 degrees, with good heat inside would indicate a faulty thermostat. Add no heat inside to that situation, you may be looking at a water pump with the wrong rotation. If you have instant pressure in cooling system, or nearly instant, that could indicate a combustion leak, or an air pocket inside the system, both of which can also keep the coolant from flowing.
Last edited by fletchFL; 07-02-2013 at 07:13 PM.
#3
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I'm using dash gauge for reading. I plan on getting it scanned for actual temp Friday to make sure that's working.heat works inside. I'll check fan direction & heat off radiator. It takes like 4miles of driving to get it yo temp of 210. The head was machined n seal tested and it doesn't leak anything. I'll try the starting it w.o cap n see if it spits it out.Also if I run it at 55mph it stays at 210 but if I drop down it starts getting hotter. I'll check all that though! Thanks
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Year: 2004
Model: Grand Cherokee
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I'm using dash gauge for reading. I plan on getting it scanned for actual temp Friday to make sure that's working.heat works inside. I'll check fan direction & heat off radiator. It takes like 4miles of driving to get it yo temp of 210. The head was machined n seal tested and it doesn't leak anything. I'll try the starting it w.o cap n see if it spits it out.Also if I run it at 55mph it stays at 210 but if I drop down it starts getting hotter. I'll check all that though! Thanks
#5
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It's not hot here in MI lol I'm gonna go run it all over trails tonight to see how hot it'll get just putting around. I'll shut it off at 240 though. And I'll get the rest checked out Friday to see if any of it could be affecting it. Thanks allot for advice!!! I hope its something dumb and runs cooler then what it is!
#7
Old fart with a wrench
Not a problem, Jess. That's what we're here for, to spread our knowledge and experience to help others. Thanks for posting your results. It may help someone else.
BTW, my WJ 4.0 NEVER gets above normal, even sitting idling for extended periods, or city driving with stop-and-go at 90* OAT. It must be I got one of the good ones!
BTW, my WJ 4.0 NEVER gets above normal, even sitting idling for extended periods, or city driving with stop-and-go at 90* OAT. It must be I got one of the good ones!
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Year: 2004
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