Heater blows cold air

Tiny
KEDI
  • 2004 PONTIAC MONTANA
  • 250,000 MILES

Pontiac Montana van. Heater blows cold air at idle but warms right up as RPM increases. Any idea what causes this. As RPM increases warm/hot air increases.

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Saturday, January 21st, 2012 AT 4:33 PM

1 Reply

Tiny
FIXITMR
  • MEMBER

Could be partially blocked/plugged heater core. Backflushing is usual cure.

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Saturday, January 21st, 2012 AT 4:59 PM

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