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Old 02-15-2020, 05:53 PM   #1
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Join Date: Jul 2016
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My Ride: 01 E46 99 E39 Wagon
Bad heater valve?

After replacing alternator blower went out I replaced the ?blower it works now also. My problem is that in order to get heat I have to keep moving climate control temperature up and down until the heat starts working. Sometimes it works quick and sometimes it takes while. Is the heater valve going bad? If so can I wait until it opens then unplug it to see if heat w works every time or is there a different way of checking
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Old 02-15-2020, 08:07 PM   #2
Nick DeZan
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Model: 2004 330ci,2013 535i
The valve is controlled by PWM, so unplugging it wont help. If you feel the output hose for heat when you have it turned on but not working, a cold hose means the heater valve is not opening.
My F10 535i had a similar problem with the dual climate control, heat on the passenger but none on the drivers side. Bought a heater valve repair kit off ebay from the seller in the Ukraine. Very nice kit and was fairly easy to rebuild, works perfect now. Could be other issues of course, but feeling the valve output hose is the easiest for valve problems.
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Old 02-15-2020, 08:16 PM   #3
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The heater valve is open by default, when unpowered.
Just remove it and inspect, see if the internal valve is stuck or free.

I'd also scan the IHKA module for trouble codes with INPA or BMW Scanner 1.4.

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