Question about Pontiac Grand Prix

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I have a 2005 Grand Prix GT with dual zone heating. The heat blows hot for awhile once the engine warms up then will start blowing cool air then it may start blowing warm again. It doesn't matter if I have the temp set at 70 or 80 and it's only 40 or 50 in the car. I've replaced the thermostat and had the cooling system flushed already. It there a cabin temp sensor that may be bad?

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  • Pontiac Master
  • 1,250 Answers

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

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  • 46 Answers

SOURCE: my truck dosnt get hot in the cab blows warm cool air!

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

dgjtex
  • 405 Answers

SOURCE: After car heats up (slow to heat) it stil blows cold until moving

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Posted on Dec 22, 2008

SOURCE: 2002 grand prix, will not blow hot air, engine

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

  • 714 Answers

SOURCE: Heater doesn't put out heat.

could be your temp control actuator which is under the dash

Posted on Jan 31, 2010

  • 335 Answers

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.

  • Remove the left instrument panel (I/P) insulator.
  • Remove the knee bolster bracket bracket. Disconnect the electrical connector from the left air temperature actuator.
  • Remove the mounting screws from the left air temperature actuator.
  • Remove the left air temperature actuator.
  • Posted on Nov 06, 2010

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