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No heat at highway speeds (archive)
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Posted by Steve Hewett on December 06, 2001 at 21:08:41:

I have an '87 528ea with 200k. Heater works great around town, but sometimes on the highway it pumps cold air. The blower is fine, the switches are fine, the air just comes out cold. As soon as I slow down, the air warms up. Sometimes it blows hot air on the highway. Any ideas? I've replaced the heater control valve twice over the last 110k and I'm about ready to do it again...

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