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Hey, its getting cooler now and whenever I try to turn the heat on, only semi warm air comes out and then just cool air....what could be the problem?:confused: I DON'T WANT TO FREEZE TO DEATH!!!:wow:
 

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Heater core?
 

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Heater core could be blocked, thermostat could be stuck in the open position, various sensors, etc.

What year car?

Did you try to scan for codes?
 

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If your heater core would leak, you would suffocate (happened to me. Fumes create a mist in the passanger compartment, first sign is condensation on the windshield, sometimes greenish from the coolant.

What could happen is that the hoses or the heater core are clogged. Then you have a problem. On one hand your heater is not working, on another, the rest of your cooling system is operating at higher pressures.

Wiggle the hoses first, check for small leaks, and then do a complete drain of system with some cleaners.
 

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have you checked the coolant level ?Then check the heater hoses that go to the back of the firewall , if you have hot hoses going into the heater and it still blows cold air your HVAC blend doors could be not working or misaligned .
 
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