# 2002 grand cherokee 6 cyl coolant temp

**URL:** <https://community.cartalk.com/t/2002-grand-cherokee-6-cyl-coolant-temp/34272>\
**Category:** Maintenance/Repairs\
**Tags:** cherokee, coolant, jeep\
**Created:** [July 31, 2009, 2:21am UTC](https://community.cartalk.com/t/2002-grand-cherokee-6-cyl-coolant-temp/34272 "2009-07-31T02:21:46Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![asadar](https://avatars.discourse-cdn.com/v4/letter/a/8c91f0/32.png) [@asadar](https://community.cartalk.com/u/asadar)\
**Post date:** [July 31, 2009, 2:21am UTC](https://community.cartalk.com/t/2002-grand-cherokee-6-cyl-coolant-temp/34272/1 "2009-07-31T02:21:46Z")

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In my 2002 Grand Cherokee, I replaced the water pump and the thermostat about a month ago. Ever since, the temperature of coolant doesn’t go up very high, it decreased about thirty degrees. I replaced the temperature sensor to a new one, replaced the thermostat to a brand new one but the same thing continues to happen. The temperature of the coolant does not go up to the original 195 degrees. When the engine is idle for a certain amount of time, it goes about 195 degrees. But when I drive, it goes back down thirty degrees. What is causing this problem?

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**Author:** ![budd2049](https://avatars.discourse-cdn.com/v4/letter/b/77aa72/32.png) [@budd2049](https://community.cartalk.com/u/budd2049)\
**Post date:** [July 31, 2009, 2:34am UTC](https://community.cartalk.com/t/2002-grand-cherokee-6-cyl-coolant-temp/34272/2 "2009-07-31T02:34:05Z")

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Thermostats are designed to open at certain temperatures…perhaps the ones you’re using open at too low a temperature. You can often find multiple temperatures for the same model.

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**Author:** ![asadar](https://avatars.discourse-cdn.com/v4/letter/a/8c91f0/32.png) [@asadar](https://community.cartalk.com/u/asadar)\
**Post date:** [July 31, 2009, 2:47am UTC](https://community.cartalk.com/t/2002-grand-cherokee-6-cyl-coolant-temp/34272/3 "2009-07-31T02:47:34Z")

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i’m sure it was 195 f thermostat.

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**Author:** ![budd2049](https://avatars.discourse-cdn.com/v4/letter/b/77aa72/32.png) [@budd2049](https://community.cartalk.com/u/budd2049)\
**Post date:** [July 31, 2009, 3:36am UTC](https://community.cartalk.com/t/2002-grand-cherokee-6-cyl-coolant-temp/34272/4 "2009-07-31T03:36:50Z")

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There’s really nothing else that can cause an “overcooling” condition except for an incorrect (or stuck open) thermostat, or a problem with the temperature sender/gauge. You said you replaced the temperature sensor, which goes to the computer. Did you maybe mean to replace the temperature sender which is what goes to the instrument panel gauge?

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**Author:** ![asadar](https://avatars.discourse-cdn.com/v4/letter/a/8c91f0/32.png) [@asadar](https://community.cartalk.com/u/asadar)\
**Post date:** [July 31, 2009, 10:30pm UTC](https://community.cartalk.com/t/2002-grand-cherokee-6-cyl-coolant-temp/34272/5 "2009-07-31T22:30:37Z")

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I replaced sensor that goes to computer . Thermostat was replaced with brand new ones twice already . thanks for your replies .

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**Author:** ![hellokit](https://avatars.discourse-cdn.com/v4/letter/h/6a8cbe/32.png) [@hellokit](https://community.cartalk.com/u/hellokit)\
**Post date:** [July 31, 2009, 11:49pm UTC](https://community.cartalk.com/t/2002-grand-cherokee-6-cyl-coolant-temp/34272/6 "2009-07-31T23:49:49Z")

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How is the engine cooling system supposed to operate? Not sure? A mechanic could show you what to do and how to make the temperature checks with an infra-red thermometer. And, you’ll save money by NOT changing all those parts.