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Old 12-01-2012, 08:04 AM   #24
Big Geek
Registered User
 
Join Date: Dec 2007
Location: Aurora,Il
Posts: 45
My Ride: 2001 325i
It's your water pump/thermostat. Listen to what everyone is telling you. The water pump is moving more water when your revs are high. Hence the warm air when moving. If it was the control valve you would not have hot air at all. But its your money. Piss it away as you see fit.
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