My heat blows cold while it idles, but gives hot.

Tiny
ANONYMOUS
  • 1999 BUICK CENTURY
  • 150,000 MILES

My heat blows cold while it idles, but gives hot heat when driving.

Wednesday, February 20th, 2013 AT 5:22 PM

1 Reply

Tiny
JDL
  • EXPERT
  • 16,305 POSTS

You may need to flush heater core? The water pump slows down at idle, speeds up at higher rpms. Coolant flow through heater core slows down at idle. If heater core is restricted, even less flow at idle.

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Wednesday, February 20th, 2013 AT 6:06 PM

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