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Re: Bad temperature sender and bizarre symptom... Posted by bobc [Email] ![]() ![]() ![]() In Reply to: Bad temperature sender and bizarre symptom..., Larry West ![]() ![]() |
When the temp gauge drops to zero, it is usually "on purpose" and a sign of a failing thermostat not a failing temp sensor.
Our temp gauges are controlled by the computer. When the coolant temp does does warm up to the appropriate temp in the appropriate time the computer commands the gauge to read zero ... as a means of catching the operators eye. There is a TSB that explains it far better than I (I cant seem to find it right now)
So if your temp gauge drops to zero after about 10 minutes, especially in colder weather, its a good indication that the thermostat is "stuck open" and needs to be replaced. The dead giveaway is that restarting the engine always restores the gauge to normal functionality (it resets the warm up timer).
Common wisdom is to replace both the sensor and thermostat together at the same time when either one is bad. Its cheap enough and easy enough and it makes sense. But the symptoms you report suggest that your issue is the thermostat itself, not the sensor.
btw I'd suggest a "super stant" thermostat. I've had some bad experiences with recent Whaler and others. Sad be casue Whaler used to be my goto in my 900 and 9000 days.
In regards to the revving condition ... I suspect it is unrelated to the thermostat or sensor. Revving like that is more often due to the throttle body getting old any flaky (I too am accused of just this!). You might start with a routine clean and lube of the TB. And of course have a good look at all vacuum lines (small vac leaks another common cause for the revving symptom)
That said, intermittent revving like that *can* be attributed to the ECU getting bad or intermittent/inconsistent coolant temp data ...so that might support the "bad sensor" theory.
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