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2006 Pontiac Grand Prix no heat from vents

Tiny
JACOLLIER
  • MEMBER
  • 2006 PONTIAC GRAND PRIX
Heater problem
2006 Pontiac Grand Prix 6 cyl Two Wheel Drive Automatic

the vehicle blows air but it dose not get hot, one hose to heater core hets hot, the other dose not, we removed the heater core and it dose not appear to be plugged, anything els in the system that could cause this?
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Thursday, November 5th, 2009 AT 3:58 PM

3 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Either the heater core is plugged or there is a coolant flow problem, like a waterpump.

It is possible that thermostat is bad, but since one heater hose is hot and the other is warm, the core is plugged or the coolant flow is restricted.

Some waterpumps are fitted with a plastic waterpump impellers, these can seperate from shaft and reduce coolant flow.
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Sunday, November 8th, 2009 AT 8:58 AM
Tiny
DAV0410
  • MEMBER
  • 3 POSTS
My 2003 had that same problem a couple of years ago and it was a cracked radiator cap. So before you go spending a bunch of cash other things chack that!
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Wednesday, December 2nd, 2009 AT 11:08 AM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Radiator cap is a possibility, it would be the least expensive item to start with, if problem persists, then look at waterpump or coolant flow restriction.
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Thursday, December 3rd, 2009 AT 6:20 AM

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