Question about Honda Civic

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I have a 1999 Honda Civic that according to the temperature gauge is overheating when I idle for any long period of time. The fan is fine so we replaced the thermostat. This did not fix the problem. I'm noticing that the car appears to warm up to temp pretty quickly in the morning but the air from the heater will still be blowing cold before eventually getting warm. Could we have possibly gotten a bad thermostat, or is there some kind of sensor that might be connected that's bad? This is something we had considered but thought if that had been the case a check engine light may have come on.

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Off the top of my head I believe your car has multiple temp sensors. One that sends info to the computer, and another that sends info to the gauge. If the heat is cold and the gauge reads hot I would first test the temp sensor for the gauge. For the check engine light to come on the sensor would have to send either no signal to the computer, or the signal would have to be out of the range that the computer us expecting from it. Your sensor may be faulty enough to be inaccurate, but not enough to set off the light. Hope this helps.

Posted on Mar 11, 2011

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