1987 BMW 635 heater blow cold air when driving on highway

Tiny
MOEJAM
  • MEMBER
  • 1987 BMW 635
  • 6 CYL
  • 2WD
  • 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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Sunday, December 21st, 2008 AT 5:13 PM

3 Replies

Tiny
DR. HAGERTY
  • MEMBER
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.
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Monday, December 22nd, 2008 AT 3:42 PM
Tiny
MOEJAM
  • MEMBER
Thank you.
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Monday, December 22nd, 2008 AT 3:46 PM
Tiny
DR. HAGERTY
  • MEMBER
Merry Christmas mate ♥
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Monday, December 22nd, 2008 AT 3:49 PM

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