These heater valves often develop a small amount of leakage past the
shutoff. I have replaced many for this. New ones don't cost much and
should be good for another 10 years. When the old ones are removed I
find I can blow a small amount of air through the closed valve but not
with the new one.

Mark

Greenamyer, William L wrote:

>Got a question on the front heater core valve.  I have it closed but
>there appears to be some coolent still getting through the core because
>it gets warm in the dash.  Is this usually an early failure mode in the
>valve or does the cable that adjusts the temperature just need to have
>the length adjusted slightly to insure the valve closes?
>
>William
>
>
>