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The best bet is that the valve that controls the flow of water to the heater core is not functioning, but on some cars it's the flaps that control the air flow through the core.
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∙ 12y ago
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Why will the Car heater for a 2002 mercury gm ls not blow hot air only cold?
Check for low coolant
Why my car air conditioner doesn't blow hot air it has cold air only?
You are low on coolant to the heater core.
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Plugged heater core. Try flushing it.
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Sounds to me that the thermostat is in backwards.
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Plugged heater core. Faulty temp blend door mechanism.
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check your coolant level
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What if your car ac blowing hot air after you changed the battery why?
your car ac will only blow hot air when there coolannt in the car is finished or the car is oveerheated.
Why does your 1999 blazer's heater only blow hot air at higher rpm's?
The thermostat could be stuck open.
