Chevrolet Repair: Heater, chevy 4x4, 4x4 pickup

Question
I have an 87 Chevy 4x4 Pickup and the Heater only blows cold air. got to some sort of module but where. It does have air and it works good

Answer
Hi Duane... are both your heater hoses hot. if they are check to see if the actuator is closing the cold air door. if hoses cold. check to see you have enough coolant and or bad thermostat. if actuator is the problem check for power. if no power check the heater control module. it should have power in and out to the actuator.if none out replace the module. if you do check to see if actuator is siezed...hope this helps