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Warning: uninformed comment.
If you're talking about the cabin temp sensor I don't know where it is in the MVIII but in the '89 MVII it's behind a small opening in the center of the dash. When you find it it'll likely be covered with schmutz which is effectively insulating the thermistor. But...I can't think of a scenario where that would cause slow cabin heating.
Another possible cause of slow heating is a thermostat sticking in or near the open position. Try measuring the voltage out of the engine temp sensor. That can be translated into coolant temp*.
Never give up,
W. V. Kelly
*In the MVII 0.65 Volts signals 195 degrees. Higher voltage will indicate lower temp.
Last edited by W.V. Kelly; April 18th, 2021 at 11:00 AM.
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April 18th, 2021, 10:58 AM
