Thread: AC issues
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Unread 07-19-2011, 10:19 AM   #2

Name: Manolito
Title: Member
Status: Offline
Join Date: May 2006
Location: Sacramento
Rate My Car: 339 / 340
Your Ride: (2) '97 328s; '04 330; '04 325iT
I have the opposite problem on a '97. Hot air blows out in the driver footwell, even when the A/C is on.

I presume that one side of the heater control valve has failed. The heater control valve is under the hood near the brake master cylinder.

I want to be sure that this is the problem before spending $225 on a heater control valve because I have to pull the air plenum off the firewall to get to the hoses on the heater valve. I replaced the heater hoses on my other '97 and it is a PITA. If I have to do this heater valve, I will obviously replace ALL my heater hoses while I am in there.

When I get time, I will take a voltmeter and try to figure out how the heater control signals the heater control valve. Then I can create a signal, or cross the wires, to see if the problem is the valve or the heater control.
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