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Top screen vents constantly hot, front faceing vents cold

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Hi guys,

 

So on the e34 i've just picked up, the heater doesn't seem to work properly.

 

If I open the screen vents up, irrigardless of the temperture setting, it will blow hot. And the front facing vents blow cold no matter what, and the feet facing vents blow hot no matter what.

 

Any ideas?

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You would be better including what model and year of the car . The controls on the dash can be automatic or manual and there are two types of board on the heater itself. So you need to know which ones you have got.  

 

The heat is controlled by two water valves on the left of the bulkhead. They default to open but can also get gummed up. You can test if the valves are getting a signal to close with a meter.

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Take a picture of your controls - there are a LOT of different permutations. 

 

Knowing what controls you have will help get the right advice to you.

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