E46Fanatics - View Single Post - Suspect Heater Valve, but no DTC's??
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Old 10-21-2009, 10:45 PM   #5
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Join Date: Dec 1969
Location: Hilliard, Ohio
Posts: 156
My Ride: 1999 328i
This is an old thread but it turned up on my search for "heater control valve".
I found this post intriguing because I am also throwing code 92 EVAP capillary leak, .5mm detected. Aside from the code, I'm noticing a regular tapping sound which occurs every 8-12 seconds or so. I have narrowed down the sound as coming from my heater control valve (attached to left front strut housing just below/beside the MAF sensor and intake boot).

It hasn't started getting cold yet around here so I have not had a chance to test the heating ability of the system --a symptom noted in other posts.

So, my question is: is my heater control valve bad or is it more likely that related hoses are cracked/leaking? or is it indicative of other problems?

As a side note, possibly related, my coolant reservoir bleeder screw has broken resulting in some fluid leaking. I've just ordered all the parts for a cooling system overhaul. Anyone think this will stop the heater valve from tapping?
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