Question about 2003 Pontiac Grand Am

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I have no heat and it is winter here in Calgary. i changed the thermostat all the fuses in the engine and in the door panel and the wiring from both fans to the fuse box what now?

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It is time to discover the temperature of the coolant in your engine whilst it running.
Use a cooking thermometer and test the temperature after about 10 minutes of operation.
It should be about 160 - 200 degrees Fahrenheit.
(Convert to Celsius if you wish.)
If it is not, you still have a problem with a "too cold "engine.
If it is, you have a problem with heated coolant circulation.
Suspect a heater control valve that is not opening, and allowing the heated coolant to flow through the heater inside the car.
This might be the valve, or the control on the dashboard, a pinched heater hose, or a vacuum leak somewhere.
God bless your efforts.

Posted on Dec 11, 2015


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Is engine coming to normal operating temp

Posted on Dec 11, 2015


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1. Your engine thermostat is broken and stuck in the on possistion. In the winter months, if its stuck in the open posistion, the vehicle may never get warm enough for the heater to blow hot air (i had this problem once, 13 degrees outside and even tho we had been driving for an hour, not a single bit of warm air... fixed instantly with new thermostat) this is a cheap repair

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3. and least likely is that your heater door wont open. Does your a/c still work fine? if yes, if you leave the ac on, and turn it from cold to hot, does it stay exactly same temp or cold? or slightly warmer? if it stays the exact same tempature of cold and you cant tell that anytinh has changed, the door that closes the ac and opens to heater could be stuck/broken, etc. or the cable or electric wire controlling it could be bad..

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  • Remove the air temperature actuator.
  • Remove the air temperature actuator wire harness connector.


  • Fig. Air temperature actuator removal
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    1. Install the air temperature actuator wire harness connector.
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