Question about Cars & Trucks
3 possible solutions
- air in the system
- thermostat stuck ( closed)
- heater valve stuck in cold position
Posted on Nov 18, 2014
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Posted on Jan 02, 2017
The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.
Since you state the 2 things you ruled out, that leaves only the water pump. Is the car running hot? The thermostat may be sticking as well... but im leaning toward the pump.
Posted on Jan 21, 2009
Check the blend door actuator. Not sure where it is but usually right of center on the heater box, near the core. Looks like the picture below. Maybe you can trace the wires from the control panel. These actuators have a tendency to strip their gears--you may even hear it clicking as it tries to rotate the door. If not, plug it back in after you take it off to see if it will actuate. If the actuator turns, doublecheck the door to see if you can rotate it by hand. If the door is jammed, you may have to pull the whole box out to repair it. Let us know if you have more questions.
Posted on Dec 17, 2010
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