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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 01-17-2005, 08:42 AM   #1 (permalink)
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Today I started my car (-10 below zero ) and I noticed the right side of the cars vents blew cold air while the driver sides vents blew hot air. I had both sides set to 90 degrees with the middle dial set to 3 red circles (hot). Am I missing something or can it be that the "Dual Climate Control" is busted on the right side?I have closed all passenger vents just so the car will warm up. It's a 1998 528i. Any help will be appreciated.

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Old 01-18-2005, 11:11 AM   #2 (permalink)
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I sure sounds like the climate control switch on the right side is broken...I'd start there.
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Old 01-18-2005, 12:02 PM   #3 (permalink)
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I have the exact same problem....people have been telling me a broken heater valve....
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Old 01-18-2005, 12:08 PM   #4 (permalink)
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Has anyone fixed the problem before? or are you just closing those vents for now?

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Old 01-19-2005, 11:36 AM   #5 (permalink)
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Funny thing today....... All vents now blow warm air.
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Old 01-19-2005, 11:42 AM   #6 (permalink)
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Originally posted by ///Matt@Jan 18 2005, 11:02 AM
I have the exact same problem....people have been telling me a broken heater valve....
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If it were a broken heater valve, then you would have simultaneous problems with heat on the left and right side. There's only one heater valve that sends heat to the passenger compartment. The problem lies with the dual climate controls...either electrical, or vacuum (which would cause the vents on one side of the car to either not open or not close).
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Old 01-20-2005, 06:19 PM   #7 (permalink)
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I am not that familiar with your car but on my E32 we have stepper motors (air distribution motors) and they control the opening and closing of the various vents in the dash of the car. Occassionally the main controller gets confused and at shutdown the valves are not positioned to the default position or the controller gets confused during selection of a mode and does not correctly position the valves according to your selection. Rebooting (shuttting the car off and then giving her a few minutes to settle before restarting the car) MAY, at least temporarilly solve the problem. Do you ever hear a humming sound behind the dash at shutdown or when first turning on the ignition (prior to start) if yes, those are the steppers.
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Old 01-21-2005, 03:26 PM   #8 (permalink)
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Originally posted by Bear@Jan 20 2005, 06:19 PM
I am not that familiar with your car but on my E32 we have stepper motors (air distribution motors) and they control the opening and closing of the various vents in the dash of the car. Occassionally the main controller gets confused and at shutdown the valves are not positioned to the default position or the controller gets confused during selection of a mode and does not correctly position the valves according to your selection. Rebooting (shuttting the car off and then giving her a few minutes to settle before restarting the car) MAY, at least temporarilly solve the problem. Do you ever hear a humming sound behind the dash at shutdown or when first turning on the ignition (prior to start) if yes, those are the steppers.
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there is a faint sound- buzzing when it is cold out with the car not started, why is that?

Dan
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Old 01-23-2005, 12:31 PM   #9 (permalink)
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Originally posted by dberger+Jan 21 2005, 03:26 PM--><div class='quotetop'>QUOTE(dberger @ Jan 21 2005, 03:26 PM)</div><div class='quotemain'><!--QuoteBegin-Bear@Jan 20 2005, 06:19 PM
I am not that familiar with your car but on my E32 we have stepper motors (air distribution motors) and they control the opening and closing of the various* vents in the dash of the car. Occassionally the main controller gets confused and at shutdown the valves are not positioned to the default position or the controller gets confused during selection of a mode and does not correctly position the valves according to your selection. Rebooting (shuttting the car off* and then giving her a few minutes to settle before restarting the car) MAY, at least temporarilly solve the problem. Do you ever hear a humming sound behind the dash at shutdown or when first turning on the ignition (prior to start) if yes, those are the steppers.
[snapback]275776[/snapback]


there is a faint sound- buzzing when it is cold out with the car not started, why is that?

Dan

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Old 01-23-2005, 12:34 PM   #10 (permalink)
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If the buzz is coming from the engine compartment, drvers side , it is the stepper motors repositioning themselves. This is a commoin happening but to those of us not familiar with the BMW way of doing businnes it can be scary. On my'88 E32 you can hear the fan for the DME Motronic box humming away at start.
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