Erratic engine temperature reading

1997 JEEP GRAND CHEROKEE

152,000 MILES • 4.0L • V6 • 4WD • AUTOMATIC

SLAWBONES

MEMBER
1 POST

Hey, I start my vehicle for the first time each day (or when completely cooled off) It appears to run fine. But after it warms up the temperature gauge jumps to red level and starts to lose power, sputter to a stop when slowing down to turn etc. I’ve flushed system , replaced thermostat everything possible I could think of except replacing the sensor for temperature gauge. That is what I was planning to do today but I thought I’d ask in case it sounded different problem to you all? Any suggestions?

Mar 3, 2021 at 3:51 AM

DANNY L

✓Experienced Mechanic
5,648 POSTS

Hello, I'm Danny.

Has the vehicle been giving any type of overheating symptoms or just going into the red? It is a possible faulty coolant temperature that could be giving a false reading to the vehicles computer putting it into limp-reduced power mode. Here is a tutorial showing how the sensor works and symptoms:

https://www.2carpros.com/articles/symptoms-of-a-bad-coolant-temperature-sensor

https://www.2carpros.com/articles/how-a-coolant-temperature-sensor-works

I've attached picture steps below on how to replace the coolant temperature sensor on your vehicle. Let us know what happens and keep us updated in case you have any further questions on this issue. Hope this helps and thanks for using 2CarPros.

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Mar 3, 2021 at 1:43 PM

Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.