I just replaced the pushbutton unit on an 83' 500sl with a refurb from mercedesshop. The blower never came on before. After replacing the unit the blower does work. However when the blower is running, regardless of which button is pushed (except off) air comes out of the three center vents. Very little air comes from the footwells. If I close the center vents the air seems to be diverted to the defroster vents. There was an aftermarket stereo installed when I got the car. During installation could they have damaged something. Or does this sound like a more common problem. I've pretty much accepted the fact that I'm going to have to replace everything in this car. So what's next?

Be sure that the wires are in the right side of the control unit. I have seen them swaped on many occasions. It usually does not hurt anything, but should be checked. You have to get the CD or the manual to check this. There is a good section on climate control in the CD.

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Benzmac:
1981 280GE SWB
1987 16V
ASE CERTIFIED MASTER AUTO TECHNICIAN
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