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Re: Heater Problem (archive)
[ Follow Ups ] [ 6-series (E24) Message Board ] [ Msg. Board FAQ ]
Posted by DonM on January 03, 2000 at 15:15:33:

In Reply to: Heater Problem posted by Jeff on January 01, 2000 at 22:19:42:

: The heater blows hot air while idling. Once I start accelerating, it starts blowing cold. Would this be the thermostat.

: Any help appreciated.

: 85 635
: 80 635

The problem is your heater valve (located on the firewall right above the brake cylinder). When the engine speed increases, the water pressure increases and if the heater valve is no longer working, the higher pressure will force the valve shut. Therefore you get heat when the engine idles but not when it is running.

It's an easy repair. You can either replace the valve or there is a rebuild kit available that replaces all of the internal parts of the valve that is cheaper... Your choice.

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