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 How to bench test a heater valve?
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United Kingdom
2158 Posts

Posted - 30 Oct 2017 :  12:10:00 Show Profile Reply with Quote
Any thoughts on how to do this?

The one in my car seems to be stuck on full heat no matter what position I try. I also have a couple of spares but wondered if it was possible to bench test them to see if they're any good?


V4 Fanatic

238 Posts

Posted - 01 Nov 2017 :  22:48:32 Show Profile Reply with Quote
The valve should open and close if you move the lever that the cable attaches to.
Also the adjuster thingy should move if you heat the bulb at the end of the thin copper tube.

'72 97
'77 96L conv.
'79 96GL (LPG)
'83 900i (LPG)
'95 900SE conv.
'99 9-3T

Edited by - 72sonett3 on 01 Nov 2017 22:49:24
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V4 Fanatic

United Kingdom
266 Posts

Posted - 30 Nov 2017 :  16:50:10 Show Profile Reply with Quote
To ensure it's not letting by, just put it in your mouth and suck, but keep the suction on for a while to make sure it's not letting by slowly.
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