Question about 2001 Chevrolet Monte Carlo

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Heater Blows cold air

Coolant is good. Just replaced thermostat - its good. I'm thinking the heater actuator!. Always blows cold air. Never gets hot

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You could have a blocked heater core. Check for two heater hoses running into the firewall in the back of your engine. They should be together and about 5/8" in diameter. If one is hot and the other is cooler then your heater core is blocked. Unhook both hoses and use a garden hose to back flush. Be sure to catch the coolant and dispose of it properly.

Posted on Mar 21, 2009

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