Question about Pontiac Grand Prix
It looks to me the outside temp sensor is defect
it is located in front of radiator
or the mix door actuator is defect
Posted on Oct 12, 2013
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Posted on Jan 02, 2017
I would check your heater control valve, that, or the core itself being bad, are the two most common problems I've had with Chevys.
Posted on Dec 04, 2008
http://www.fixya.com/cars/t1386554-91_ford If this doesn't help you tell me more, if it does, please vote me fixya, otherwise please do not give me any rating at all, the only compensation I get is my Fixya score, Merry Christmas.
Posted on Dec 22, 2008
With the engine warmed up feel the heater lines going into the firewall. You will probably find that one is very hot and the other only look warm or even cold. If this is the case the heater core needs to be flushed. With the engine cold remove the hoses at a convenient location and back flush the heater core. Reconnect the lines and warm the engine back up with the heat on.
Posted on Jan 11, 2010
SOURCE: driver side heat blows cool
Hello, this is cused by the drivers side temp door actuator. there are two electric motors that move the temp doors from cold to hot. there is one on the drivers side and one on the passenger side. you will need to replace the one for the drivers side.
Posted on Nov 06, 2010
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