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Message: <blockquote data-quote="affan66" data-source="post: 298813" data-attributes="member: 65">fyi, if you remove the heater valve, the temp control means nothing as it will just go cold cold and cold.  I did this for my E36 and it is super cold. Brrr... For my E39, I removed the heater valve, and then tried a 2nd hand one for a week. Same issue. Re-installed my ole' heater valve and the aircond is fine now. I think this is because the heater valve was blocked.  I was told by some resident experts that you need to play with the valve at least once a month.  Turn on the heater function at full blast (during a cold day) for a few minutes and then turn it back to normal conditions (aircond). This will give the valve a full workout and function properly.</blockquote>