Question about 2000 GMC Yukon XL
Sometime everything works fine then i can hit a bump and all my gauges cut off but the lights still stay on and also my heating and ac cut off completely and dont work at all then i can turn in somewhere and everything will cut back on like nothing happened
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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
Check your ignition switch by checking the voltage at the fuses for affected circuts vs. other circuts that are working well...
Posted on Jun 21, 2009
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