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2000 Pontiac Montana Heater only works at high RPMs

Tiny
JRING94
  • MEMBER
  • 2000 PONTIAC MONTANA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 170,000 MILES
At idle the heater blows cold. Go down the road or just raise the rpms and the heater blows warm. Does anyone know what the little pump is for that is in line with the heater hoses and when it should be on?
Tuesday, October 19th, 2010 AT 8:39 PM

1 Reply

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Post a pic regarding the pump

Check your antifreeze level, sounds like it is low or there is a restriction in the heater core.

If the fluid is low is will not circulate into the heater core until the water pump spins faster from the raised rpm.
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Wednesday, October 20th, 2010 AT 7:49 AM

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