why does my heater blow cold air

5

Asked by Tam Oct 30, 2015 at 03:36 AM about the 2000 Chevrolet Silverado 1500 LS Extended Cab 4WD

Question type: Maintenance & Repair

i turn my heater on and it blows but cold air

6 Answers

223,745

A couple of things, is the temperature gage running in the normal range? No change from where it was? If so, thermostat would need to be replaced. Then there is the AC actuator module up under the dash that may be bad, It controls the vent system in the dash, part of it being the outside air blend door (flap, whatever) that controls the temperature inside the cabin. Other than that, may need a coolant flush as radiator and heater core may be plugged a bit.

61 people found this helpful.
420

I have the same problem with my '06 Silverado which has dual temperature zones. It only blows cold air intermittently and only on one side. Any ideas?

42 people found this helpful.
150

Check all radiator clamps and make sure (replace) they are holding pressure and are not rusted causing pressure loss. factory clamps are spring steel prone to rust fatigue. I have found this and it causes circulation problems. eg - coolant not going through heater core.

15 people found this helpful.
310

on my 2006 chevy truck i found air trapped in the top of the heater core,,, i took the hose off and filled the heater core up and it works great now on them trucks the over flow bottle is lower then the top of heater core,, this will fix it

31 people found this helpful.

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