2002 Pontiac Grand Prix GT / Car Heater Not Working - Blowing Cold Air
Also check to see if tube that runs your climate door is not pinched or broken. the vaccum tube that runs the climate door is behind and under the battery. i had same problem a year ago and the tube was partially cut. i fixed it by cuttinga piece of aquarium tubing and spliced it back together. one other thing.....check to see if your radiator over flow cap is tight. your cap maybe bad and or cracked this would also cause the problem.
Check coolant level and bleed system if possible could be air in heater matrix
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