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2005 Pontiac Grand Prix NO HEAT WHEN IDLE

Tiny
MSTROTHER
  • MEMBER
  • 2005 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 65,000 MILES
THE GAUGE SHOWS THE CAR IS PLENTY WARM TO BE BLOWING WARM AIR; BUT IT BLOWS COOL AIR UNLESS YOU GO FAST, THEN IT WILL WARM UP.
WHEN YOU ARE JUST SITTING IT WILL BLOW COOL AIR. WHAT COULD CAUSE THIS?
Tuesday, January 5th, 2010 AT 7:51 AM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Either a bad waterpump of a restriction in cooling system.

If cooling system has never been flushed, I would drain and flush cooling system and replace thermostat.

If problem persists, replace waterpump. Some cars are equipped with waterpumps that have a plastic impeller, these can seperate from shaft and reduce coolant flow at slow speeds.
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Wednesday, January 6th, 2010 AT 6:32 AM

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