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There is a valve which controls the flow of coolant to the heater core, which is a small radiator located inside the passenger compartment. If this valve is open, hot coolant will be pumped into the heater core, which will get hot and warm the air passing over it. If the lever or temperature selector in your vehicle does not control that valve, then the cable is broken, or the electrical control device is not working.

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โˆ™ 2006-09-02 05:27:12
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Q: Why would the heater blow hot air all the time on my 79 Corvette?
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