Reply With QuoteCheck the wiring harness to the heater control valve first. If it's all plugged in, it's likely the HCV plungers are stuck. Usually only one side sticks. Do you have heat issues on just one side of the cabin?
Originally Posted by James
If I replace my heater valve, will this stop hot AIR FROM CONSTANTLY blowing out of..
bottom vents??
James 89 525i, long list of fixes getting shorter
Grand Master
very likely this is your problem
Check the wiring harness to the heater control valve first. If it's all plugged in, it's likely the HCV plungers are stuck. Usually only one side sticks. Do you have heat issues on just one side of the cabin?
Bellevue WA
90 535iM - not much stock remains. 3.7 liters, ported head, cammed, 3.73 diffy, M5 brakes, MAFed, yadda yadda yadda
86 Porsche 951 - Track Toy
Yes
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