Question about 1990 Buick Reatta
The temp switch will not change the temp- stuck at 74 degrees
The unit in the dash with the buttons gets dirty. You can remove it from the dash, take it apart and clean the pads under the buttons and I have had 100% success fixing the problem
Posted on May 21, 2014
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Posted on Jan 02, 2017
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Oct 19, 2014 | 2015 Jeep Wrangler
The engine coolant temperature sensor provides an input voltage to the PCM. As the coolant temperature varies, the sensor resistance changes resulting in a different input voltage to the PCM.
When the engine is cold, the PCM will demand slightly richer air/fuel mixtures and higher idle speeds until normal operating temperatures are reached.
The engine coolant temperature sensor is also utilized for control of the cooling fan.
Fig. 1: Engine coolant temperature sensor location - 3.3L and 3.8L engines
Check this test procedure:
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