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There is a divertor controller under the dash that controls between heat and cold. Sometime the wireing harness works loose.
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∙ 15y ago
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Why would a 2001 Chevy Blazer heater only blow cold air?
Low coolant in the system. Defective heater control valve. Clogged heater core.
Why does my 2004 Monte Carlo heater blow cold air?
Low coolant? Bad thermostat? Heater control cable not adjusted properly? Heater core airbound? Heater core plugged?
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The heater valve could be failing to open for one reason or another.
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Either the linkage from the temp control unit to the valve on the heater core (which is behind the radio and temp controls) or it is the heater core itself.
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Check Antifreeze level..make sure there are no leaks under the vehicle.
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you need to replace your heater core
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Either a faulty thermostat or you have a low coolant level.
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you are low on coolingliquid !
