Mechanics

BUICK CENTURY HEATER PROBLEM

1999 Buick Century • 150,000 miles

My heat blows cold while it idles, but gives hot heat when driving.
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Guest
February 20, 2013.



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.

JDL
Feb 20, 2013.