Quote:
Originally Posted by SlickGT1
On our 4.8is, the tstat has a sensor. That sensor technically measures when the tstat fails. I know this because I had it happen. It was a ridiculously simple job on the 4.8.
That being said. Does your car take a really long time to warm up in the morning. That is also an indication of a failed Tstat.
I also question how these mechanics know you have a failed tstat. If there is no code for it, how did they come to this conclusion?
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This what the OP stated
The shop is saying that my thermostat need replacing, this from their computer, no indication on the dash
A failed thermostat will not set off a check engine or service engine soon light, but it will be logged into the DME as a problem, which can be retrieved if you have the proper software connected to the car.