Re: Air vent thump

• Subject: Re: Air vent thump
• From: [email protected] (Garrett McWilliams)
• Date: Fri, 09 Dec 1994 06:00:06 +0500

The valve which controls how much coolant goes through the heater core does
not have any position between full-on and full-off.  The climate control system 
cycles the valve on and off as needed to keep the cabin temperature at the 
set value.  This cycling is inaudible on my 533i with the engine running, 
but your car has much less background noise I'm sure. 

Garrett
'83 533i  181k

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