2000 Grand Cherokee in-line 6

Asked by GuruBLC3G Dec 29, 2018 at 11:25 PM about the 2000 Jeep Grand Cherokee Laredo 4WD

Question type: Maintenance & Repair

Replaced heater core one year ago and had no heating issues. Now engine
only heats to roughly 120-130 degrees; not usual 160 degrees. What are probable problems? My first instinct is a stuck thermostat but don't know if
heat sensor would cause this problem.

1 Answer
43,910

Hornet_2497 answered 5 years ago

If it is really running cold, then you are right to suspect the thermostat stuck open. If you replace it, get the recommended heat range which I think is 195 F and make sure it's not installed backwards. But if the hoses feel plenty hot, then the temperature gauge sensor may be giving you a false low reading. I like to use an infrared temperature sensor gun to check engine temps at the thermostat housing. Mine reads 195 F when fully warmed up.

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