1987 BMW 635 heater blow cold air when driving on highway
1987 BMW 635
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
have the same problem?
Sunday, December 21st, 2008 AT 5:13 PM
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.