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Probably due to the engine having a low coolant level.It may be an air pocket in the cooler lines if the vehicle was recently serviced. The air blend doors in the heater/AC unit may be having issues if the above checks out, this would require a lot of disassembly to diagnose.
What else can I help you with?
Why does the heater blow heat while driving and cold at idle?
you need to replace your heater core
Why would a 96 Taurus wagon heater only blow when running at high RPMs and cool down when idling?
it has a partially clogged heater core.replace the heater core
What causes a car heater to blow out less hotter air?
Not enough coolant is running through the system chek for leaks and chek your heater core
Why does your heater blow cold air while idling but blows hot air while driving?
Low coolant, failed thermostat, partially plugged heater core...............
Your heater will not blow on your 1996 Ford Contour?
heater will not blow on a 1996 ford contour
Why does your heater not blow out warm air?
if the heater does not blow out warm air change the setting.
How do enjoy running?
I enjoy running because it is fun.and you can feel the wind blow your hair while running. and you keep in shape.
Why does the heater not blow air?
The heater does not blow air because it emits infrared rays that have heat molecules within them, thus releasing heat, not blowing it. A heater does not blow air becasue there is no moving air source within the heater. The heater emits infrered rays that cause heat to slowly flow out of the heater.
Can you drive your ford F150 to Kansas with your heater core blow en?
I wouldn't recommend it. Odds are that you'll lose coolant liquid through the heater core, which eventually can lead to the car running dry and overheating.
How will the heater react if the heater core is stopped up?
Your heater will blow cold air only.
What happens if you do not use a thermostat?
Running a vehicle without a thermostat will cause it to take longer to warm up and your interior heater may not blow hot air.
Why would a heater blow cold air at an idle and warm air while driving?
Low on coolant. Stuck open thermostat. Poor circulation (plugged heater core).
