Question about Cars & Trucks
Cold setting works OK but at max heat the temp is only warm. Cooling system thermostat has been recently changed but has made no difference. Blower working OK
You more than likely have a problem with the temperature control blend door inside the air ducting, this door sits between the heater core and the AC evaporator core and mixes the air for the desired temp at the registers/vents. More than likely it is sticking due to being warped from heat. To replace this door and its actuator requires the dash be removed from the car.
Posted on Feb 08, 2012
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Posted on Jan 02, 2017
It could be a faulty thermostat. Did it do the same thing before u replaced the t-stat? It sounds like it's sticking closed, then all of a sudden it opens, coolant flows correctly. I'd consider changing it again. Check to make sure parts store is giving u the correct temperature thermostat also. Maybe it's too high for your Ford, delaying the opening.
Posted on Nov 25, 2008
Sounds like either the valve which lets water into the heater core is not working properly or the vacuum operated door which directs blower motor air over the heater core is not opening, Could be a vacuum hose loose or it has a hole in it.
If you want to further discuss, let me know,
Posted on Apr 28, 2009
the heater control valve is not opening all the way.
look under the hood on one on the heater hoses .
you should find a vaccum controled heater hose valve.
make sure your not low on coolant also.
also make sure none of the heater hoses are pinched off.
Posted on Nov 25, 2009
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