Update: This morning, expecting a cold drive to work, the heat came on strong enough to cook eggs and when set to cooler temps, did as it should. All worked well.

Then on the way home, no heat again. Unless I put the fan on low and recirculate the air. Thats the only way I get some hint of warmth. And its not much at that.

Where is the plug for the monovalve located? (I will try searching too)

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1991 560 SEL / 185k miles
1992 750il / 17k miles - project car