Question about 1997 Jeep Grand Cherokee

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I have a 1997 Jeep Grand Cherokee Laredo that the top hose that leads from the radiator to the thermostat blew the other day. I replaced the hose with no problems but the gauge in the jeep keeps indicating overheating and the code reader has a code that has the temp sensor error. This sensor which I found on the top of the thermostat top was wet inside from the coolant. Could this have shorted the sensor and does the thermostat need replacing as well?

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Thermostats become unreliable and really should be replaced any time the engine overheats for any reason. After replacing it, fill the system using plain water (just in case it overheats again) and run it and check for problems If the sensor had coolant inside the connector cavity and after running it you find more, replace it (or if it fails to operate normally). Once you are satisfied that it's OK, drain and refill with coolant.

Posted on Jun 06, 2010

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The sensor would not likely have shorted, but the sensing material may have changed due to overheating. The thermostat may also be in trouble. Replace both, then take the car to Autozone or similar business for a free computer scan, which can remove any error codes. Then drive the car to see if it resets further codes. Make sure the cooling system is topped up in both the radiator and the overflow tank. Check your other hoses for condition and replace if necessary. If the entire engine overheated, be on the lookout for antifreeze leaks around the heads and for strange misfire codes. It may have warped the heads from excess heat. Hope this helps!

Posted on Jun 06, 2010

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