On Sat, 26 Jan 2008 09:07:46 -0700, Bill Jeffrey
<wjeffreyAT@[EMAIL PROTECTED]
> wrote:
>
>In my limited experience with an American car, this is caused by low
>coolant level.With the engine at idle, the level is too low to reach the
>heater core. As the RPMs come up, the water pump flogs the coolant more
>strongly, and some of it reaches the heater core inlet.
>
>Possibly also the water pump itself - or the belt driving it.
I agree - possible low coolant (easy enough to check) but likely a bad
WP or belt.
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