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Confirmed (archive)
[ Follow Ups ] [ M5 (E28) Message Board ] [ Msg. Board FAQ ]
Posted by JakeS in Delaware on March 03, 2002 at 14:08:07:

In Reply to: Re: e28 m5 heater question posted by Lamar on March 03, 2002 at 00:17:54:

The water valve has a rubber diaphram, which tears when it ages (mine was only 2 years old). When torn, higher water flow sucks it into the outlet, causing it to block the valve. I just went through the same thing, too.


That, sir, is your water valve. BMW P/N 64-11-1-373-191. I had the exact same problem and a BMW mechanic told me the water valve was bad. I replaced my valve and now I get hot air all the time. :-)


once the car is warmed up the heater blows hot air fine until the car is reved over 2000rpm are so then the air drops to outside tempatures when it returns to idle it returns to blowing hot again. I have changed the air sensor with no change in results any suggestions?





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