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Old 08-11-2010, 09:02 PM
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Overheatting (not the thermostat)

Hey guys

My 2000 V6 with 120k on it started overheating a few days ago. After I drove about a mile the temp gage would be all the way up. After a few more miles I could hear the coolant actually starting to boil. My initial thought was it was just a thermostat. I check the coolant the after it had cooled down and it was almost totally gone but there was nothing under the car. I got the thermostat changed out and that didnt fix the issue. There was no oil in the coolant either. When it was at the shop today they said that the top radiator hose was hot but the lower hose was cold. They think its a bad head gasket but that doesnt explain where all the coolant has been going or why its overheating. Anyone have any ideas?

Thanks in advance!
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Old 08-11-2010, 09:10 PM
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Re: Overheatting (not the thermostat)

I'm guess it's a Cherokee, Wrangler, or a Grand Cherokee with the I6 Engine. Check your Water Pump and see if it's leaking from there. If not check around the engine for any leaks while the engine is on.
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Old 08-11-2010, 09:26 PM
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Re: Overheatting (not the thermostat)

Ya its a grand Crerokee with the I6
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Old 08-11-2010, 09:33 PM
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Re: Overheatting (not the thermostat)

Could be a blocked heater core which will cause the engine to over heat. Could also be that the impeller on the water pump has separated from the shaft and is no longer forcing water through the system. If it were me, I'd temporarily remove the heater core from the system and see if things go back to normal. If not, pull the water pump and see if the fan blade is spinning freely on the shaft.

If the head gasket was blown bad enough to cause it to over heat in a mile, you'd probably see it in the oil or blowing out the exhaust as white smoke.
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Old 08-11-2010, 10:12 PM
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Re: Overheatting (not the thermostat)

Both hoses on your radiator should be hot. Have you or anyone else ever put in any stop-leak into the coolant system that may have plugged up your radiator.

I'd say you have a lot of air pockets in the coolant system and your radiator is toast. Water pumps are a well known problem on the I6 4.0L though.
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Old 08-21-2010, 01:00 AM
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Re: Overheatting (not the thermostat)

sound very very similar to what i had a long time ago... check if your fan is working then get back to me. if its not i know what the problem is
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