Question about Subaru Forester
When the car is stationary, the heater blows cold air, but when the car is moving, it starts to blow hot air. The position of the controls does not make a difference. Or, weather the a/c is on or not for defrost.
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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.
if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.
Posted on Jan 14, 2009
common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.
Posted on Feb 23, 2009
Make sure the heater core is in the open position by using the shut off valve and turning it to open. next, you may have a malfunction in the direction door the directs the air flow in the dash. a lever may have become lose or separated. may be a bad servo motor not directing the door to move to the heater position. i would start by checking that shut off valve first on the heater core.
Posted on Mar 13, 2009
I read a solution for chevy impala's that heater only blow out hot air when driving and cool air blows when sitting at red light and/or in idle position. A solution was given but I dont understand the abbreviations - "CK FOR VAC LEAKING TO TEMP BLEND DOOR". Please spell out the words so that I can understand.
Posted on Oct 05, 2009
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