I have an issue similar to taz. I have a 2000 4x4 3.0 (flex). I recently had to do some cooling system work and now my temp gauge is not working. The system is full of fluid, the thermostat is working correctly and i replaced the sensor. I verified the gauge is working by attaching a lead to the pos side of the sensor plug and grounding the other end (BTW this sent the gauge needle up like it was on Viagra when i turnd the key). I even went as far as to put dialectric grease on the leads. Can anybody enlighten me as to what the issue might be? It's getting hot in Minnesota and i have been avoiding using the A/C for fear of cooking my engine. BTW 175,000 and still going strong!
thanks in advance for any help.
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