Why am I not getting any heat in my 1992 Chevrolet Cheyenne?

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CoryHolwell

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I have a 1992 Chevrolet Cheyenne I can not get the heat to work in. The motor heats up fine and the thermostat works properly. I have replaced the heater core, all hoses, thermostat, heater control unit, coolant and thermostat housing. My antifreeze is full, Any suggestions on something i may have missed?
 
did you bleed the air out of the cooling system? air will keep it from circulating.
 
Heater door that is not opening, some are electric, some are vacuum, check the fuses, then look for a Vacuum leak.
 
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