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Old 11-10-2012, 09:46 AM   #7
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Join Date: Nov 2012
Location: Los Ranchos, NM
Posts: 7
My Ride: E46
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You are not alone. I have the exact same issue on my '01 325i. A constant 12V to the HCV even when the key is not in the ignition.

I have no answer at this point. I have read on this or another E46 forum that the HCV actually pulses open and closed to control the flow of hot coolant into the heater core. according to the post there are 5 or 6 sensors that control this pulsing.

I just finished replacing the idler belt pulleys, so this is next on my list of things to fix.

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