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in my 07 jeep compass 2.4l 4wd, the check engine light came on the other day and noticed it would heat up to normal and as soon as you turned on heat or came to a stop it got cooler and dropped to the first bar. i replaced the thermostats and the code for low coolant temperature, and it is still heating up to normal but when you turn on the heat or at idle it cools off to the first line untill you start driving it and turn off heat and it heats up to normal operating temp. it has good heat so kind of confused any ideas could it possibly be the coolant temp sensor? and how do you rest the codes i had the battery completely unhooked and it did not reset, any ideas to try?
 

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Well first, welcome to the forum, since I see this is your first post! I would be thinking coolant temp sensor as well for the next thing to try, but if you have any warranty on it, I would take it in and let them diagnose it. Could be the temp sensor, could be the gauge, could be a couple things and nothing worse than throwing money into parts that aren't the problem. As for resetting the code, you can try the "key dance" method, clicking the key rapidly from "off" to "on" several times WITHOUT starting the vehicle and see if that doesn't do it. How is your coolant level BTW?

- Cherokee
 

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in my 07 jeep compass 2.4l 4wd, the check engine light came on the other day and noticed it would heat up to normal and as soon as you turned on heat or came to a stop it got cooler and dropped to the first bar. i replaced the thermostats and the code for low coolant temperature, and it is still heating up to normal but when you turn on the heat or at idle it cools off to the first line untill you start driving it and turn off heat and it heats up to normal operating temp. it has good heat so kind of confused any ideas could it possibly be the coolant temp sensor? and how do you rest the codes i had the battery completely unhooked and it did not reset, any ideas to try?
Check around the water pump to see if any coolant is leaking. Usually, when a pump begins to go bad, coolant will leak from the "weep valve" usually on the bottom side of the pump. That's my first guess as many times, if a pump is beginning to fail, coolant will not circulate properly at very low engine speeds, such as idle. This would result in cool air as no circulation is making it to the heater core.
 
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