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why does the heater in my 2000 gmc envoy blow cold air?


could be several

could be several possibilities. the thermostat could be stuck open or not there, there could be a malfunction in the climate control head which won't allow you to switch from cold temp. to hot, there could be a blockage in the heater core, the coolant might even be low. if the vehicle shows a temp. reading on the gauge and doesn't overheat, these are your most probable causes. there could also be more complex things going on that might need the attention of a certified mechanic with experience in such repairs.

Agrees with the last guy .

Agrees with the last guy . Try checking thermostat first it is the easiest and cheapest. And most common. Next common but very expensive is the Heater Core. GOOD Luck

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