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I have an 03 dmax and i was wondering what the temperture was supposed to consistently be at when the engine is warm? My needle goes to 210 degress then it will drop back down and then go back up to 210 degrees again is this normal?
 

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mine has always done that for the 3 years I have owned it. There are 2 thermostats IIRC. the only time I ever see my temp stay at a more constant temp is when the temp is above 70 degrees out. With the temps in the 30s and 40s now it is fluctuating more like you are saying.
 

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what you are seeing is gauge sensitivity in the range of 178-185. It also happens to be the crack temp of the low temperature thermostat.

The oscillation is the thermostat opening briefly, swinging actual ECT between the numbers above.

It would have been smart for GM to broaden the deadband (parked position) to include temps down to 175.
 
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