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2006 Pontiac Grand Prix heat problems

Tiny
JGRIFFIN2002
  • MEMBER
  • 2006 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 79,000 MILES
It seems that lately my heat has not been getting hot like it use to. It's blowing out semi warm air and in the winter time (like it is now) it gets pretty chilly inside. What should I check before I consider bringing it in to the shop.
Monday, December 28th, 2009 AT 3:33 PM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Heater Core "” Plugged

WARNING: The heater core inlet hose will become too hot to handle if the system is working correctly.

Check to see that the engine coolant is at the correct level.
Start the engine and turn on the heater.
When the engine coolant reaches operating temperature, feel the heater core inlet and outlet hose to see if they are hot.
If the inlet hose is not hot:

the thermostat is not working correctly.
If the outlet hose is not hot:

the heater core may have an air pocket.
The heater core may be restricted or plugged.
If both are hot, the temperature blend door in the heater plenum may be broken or stuck.
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Monday, December 28th, 2009 AT 3:37 PM

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