While driving, usually in the morning, my temp gauge will drop to 0 and the AC will stop working. I have been able to fix it by pulling the negative battery cable and reset the ECU, everything works as it should immediately. I have tested the harness going to the sensor and it has both 5v and continuity to ground. The sensor read around 500 ohms when I tested it. All hoses are hot and have pressure as they should. What's going on here? Any ideas?

 

Not sure about the resistance, that will be determined by the temperature. I'd replace the temp sensor. Might check good static, but might not otherwise.

 

Replacing the temp sensor didn't fix it. The old one tested fine. Keep in mind that resetting the ECU fixes the problem for a little while after it drops out. It fixes it immediately too

 

Bump.