Mechanics

HEATER BLOW COLD AIR WHEN DRIVING ON HIGHWAY

1987 BMW 635

Heater problem
1987 BMW 635 6 cyl Two Wheel Drive Automatic 193 miles

my heater works fine when parked or driving on low speed, but blows cold air when I speed up.I have changed the engine thermostat still the same problem. Any ideas
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Moejam
December 21, 2008.




Change the heater control valve. It is located on the firewall. Just take the four Phillips head screws loose on the top and pull out the old one and in with the new one. Part # 64-11-8-390-132. Realoem. Com is a good place to go for parts and exploded views.

Dr. Hagerty
Dec 22, 2008.
Thank you.
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Tiny
Moejam
Dec 22, 2008.
Merry Christmas mate ♥

Dr. Hagerty
Dec 22, 2008.

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