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Old 08-23-2012, 11:16 AM
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Join Date: Aug 2012
Posts: 3
a/c vents wont blow

hello everyone i just purchased a 1992 500 sl one owner car looks like it came out of the showroom , on the 3 rd day the front a/c vents stop blowing while the side vents are working fine , on the 4th day the remote locking system stop working also any suggestions.


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Old 08-23-2012, 12:08 PM
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Join Date: Apr 2005
Location: NE Ohio
Posts: 5,038

Welcome to the forum!

I'm not entirely sure about the 129s but they most likely have a vacuum system that runs vacuum pods that open/close vent dampers. So its possible that your center vent pod has failed.
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Old 08-23-2012, 03:05 PM
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Is it that the remote doesn't transmit, or that the locks don't all go up/down when the driver's door goes? it sounds like your PSE module may have failed. That's what controls all of the vacuum driven functions in the car/
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Old 08-24-2012, 09:57 AM
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Join Date: Aug 2012
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thank you alex i will check on that, and the remoter transmits fine the light flashes green and red just the locks don't go up or down.
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Old 08-24-2012, 11:40 AM
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Location: Milwaukee Wisconsin
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I hope that you got the owners manual with the car. The A/C vents and controls are very complicated. The front center vents are controlled by the small buttons with the red and blue lamps as well as the all those up and down arrows on the HVAC panel. You need to study the owners manual. The locking system is run by a vacuum pump in the trunk on the right side. Cheek fuse #6 in the trunk fuse panel (upper right side.) It is for the locking system.
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Old 08-24-2012, 12:14 PM
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Join Date: Aug 2012
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thanks i will look at the fuse, as for the a/c vents i have read the owners manual but no luck .

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