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E28 - Heater not toasty warm



The heater on my 88 M5 is not working right.  When at idle or slow speed
it is reasonably warm, but as soon as I hit freeway speed, it seems like
it blowing cold air.  Is there an air mix flap or something that could
be stuck open?  Or should I be looking at heater valve heater or core
problems? Any help would be much appreciated as its getting kinda cold
here in Portand.

Steve Billings
88 M5

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