Question about 1992 GMC Sierra C3500
Try taking the wire of the temp sender unit and touching the engine and see if the gauge goes up to hot. If so then replace the temperature sender unit ( different to the sensor unit)
Posted on Oct 13, 2013
Testimonial: "I tried that and the gauge did not move. When I start the engine it goes all the way to hot then comes back to 100 and never moves again."
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Posted on Jan 02, 2017
SOURCE: Heating System
The Engine Coolant Temperature (ECT) sensor is mounted in the intake manifold and sends engine temperature information to the ECM. The ECM supplies 5 volts to the coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the ECM monitors a high signal voltage which it interprets as a cold engine. As the sensor warms (internal resistance low), the ECM monitors a low signal voltage which it interprets as warm engine.
Fig. 1: View of the Engine Coolant Temperature (ECT) sensor Fig. 2: Engine Coolant Temperature (ECT) sensor locationTESTING
See Figures 3 and 4
Posted on Oct 01, 2008
SOURCE: the heater dont work on
it sounds like a heater door actuator is not allowing the door to swing into the heat position...as for the temp gauge there is a recall for a bad insterment cluster for that truck...a circuit board is cracked in the dash not allowing the gauge to function...call a GM dealer to get more info on this recall...the heat problem can be easliy fixed at any qualified service station
Posted on Jul 16, 2011
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