Question about 2008 GMC Sierra 1500
Gauge just fall to zero. display says enigne hot ac off. engine is not hot. the problems comes and goes. have replace engine temp sensor, thermostat, flushed radiator and put in new coolant. problem still occuring.
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Posted on Jan 02, 2017
Sounds like a head gasket to me. Turn the engine on and put your hand near the exhaust and see if you feel any moisture. If you feel or see vapor it's more than likely the head gasket. Although it could be the intake gasket as well. Either way you're looking at a lot of work.
Posted on Jul 08, 2008
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
You can follow this to reset it.
Ignition ON, initiate the TPM Learn Mode
using one of the following procedures:
After the horn chirp has sounded and the right front turn signal is illuminated, repeat step 2 for the remaining 3 sensors in the following order:
3.1. Right front
3.2. Right rear
3.3. Left rear
When the left rear sensor has been learned and a double horn chirp has sounded, the learn process is complete and the RCDLR exits the learn mode.
Ignition OFF, adjust all tires to the recommended pressures
Posted on Jan 22, 2009
On the intake manifold,toward the front. It's got 2 wires to it. That's the one for the cpu & the other has one wire & is usually in the driver's side head. That controls the temp guage.
Posted on Jun 24, 2009
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