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E28 (1982 - 1988)

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Old 01-05-2010, 09:24 AM
dino122957 dino122957 is offline
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Location: Perry, Ga
Join Date: Jan 2010
Posts: 1
Mein Auto: 1988 528e
Question heater gets cooler when driving

1988 528e-heater blows hot air when car is stopped, when the car is moving and the blower fan is on, the air cools off, both in the defrost and the floor mode-any ideas?

Last edited by dino122957; 01-06-2010 at 05:29 AM.
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Old 01-07-2010, 07:12 PM
south26 south26 is offline
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Location: Dayton, OH
Join Date: May 2009
Posts: 1,538
Mein Auto: 535i 1989
it is your heater valve. It is next to your brake master. You can get a rebuild kit for 40 dollars and it is a easy fix.

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Old 01-12-2010, 06:40 AM
karnaksnr karnaksnr is offline
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Location: Torbay UK
Join Date: Oct 2009
Posts: 7
Mein Auto: E28 M5 Motorsport
Thumbs up Same problem

Thanks Andy,

I got the same problem, will be guided by you.

Many thanks,

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