Question about 1993 GMC Sierra

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No Heat I own a 1996 gmc sierra 1500 4.3l v6.. The problem i am having is Ive changed the thermostat and am now changing the ECT sensor but my heating system is blowing cool air.. How do i fix the lack of hot air in the cab?

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  • anam747 Nov 01, 2008

    I checked the coolant flow by feeling the temp on the In / out lines and as the in is hot the out is still cool.. It will blow less than moderate heat at small intervals but nothing consistent..

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You need to verify the blend door is operating and the heater core is not plugged or coolant flow to it is restricted.

Posted on Oct 29, 2008

  • yadayada
    yadayada Nov 01, 2008

    If the in is hot and the out cool, then the core may be plugged, both lines should be hot even with the heater working normal, the exception would be hi speed blower and a very cold ait temp.

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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.
0900c1528008f125.jpgFig. 1: View of the Engine Coolant Temperature (ECT) sensor 0900c1528008f126.jpgFig. 2: Engine Coolant Temperature (ECT) sensor locationTESTING
See Figures 3 and 4
  1. Remove the ECT sensor from the vehicle.
  2. Immerse the tip of the sensor in container of water.
  3. Connect a digital ohmmeter to the two terminals of the sensor.
  4. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the engine coolant sensor temperature vs. resistance illustration.
  5. Repeat the test at two other temperature points, heating or cooling the water as necessary.
  6. If the sensor does not meet specification, it must be replaced.
0900c1528008f120.jpgFig. 3: Intake Air Temperature (IAT) and Engine Coolant Temperature (ECT) sensor wiring diagram 0900c1528008f095.jpgFig. 4: ECT sensor temperature vs. resistance values

Oct 01, 2008 | 1993 GMC Sierra

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