Engine & thermostat heating up
40

Asked by Frustratediane Sep 18, 2016 at 11:15 AM about the 2004 Jeep Grand Cherokee Limited

Question type: Maintenance & Repair

When idle, engine revs up and thermostat
gauge goes over to 260 degrees. Water is
in reservoir container.

5 Answers
103,455

KenF answered 8 years ago

Sounds like a bad thermostat. In the meantime don't let motor overheat, shut it off until you can get it repaired.

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Frustratediane answered 8 years ago

Thank you, was afraid it may be water pump, I have had to replace it twice before and I have also replaced radiator. I am now ready to replace Jeep!

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103,455

KenF answered 8 years ago

Thermostats are a cheap part ($5-8), if you take it in somewhere it'll be mostly labor fees. It's also a total DIY project if you're handy at all.

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Frustratediane answered 8 years ago

Just curious, where is the thermostat located? Is this a part that a non mechanic like myself can replace?

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KenF answered 8 years ago

4.0L? http://www.wjjeeps.com/service/cooling.htm - scroll down a ways. It bolts in place with basic tools, but you will have to drain some coolant and deal with the thermostat housing gasket. If you've never done it may want to leave it to a pro. Otherwise watch some youtube vids on replacing a thermostat for your make/model, or pick up a repair manual. Autozone's website also has free online repair guides.

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