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Old 09-08-2001, 05:23 PM
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Join Date: Nov 2000
Location: Long Island, New York
Posts: 79
1989 300SE Climate Control - Air Blowing Out Of The Defrost With AC On

After consulting the manual I learned that air should not be blowing out of the defrost vents in conjunction with the dash vents with the AC on (Normal mode). Funny thing is, when I move the temp. control to warm, the air stops blowing from the defrost vents, even as the Normal button remains engaged.

Is this a simple fix or an expensive job?

Thank you for the advice.
2004 E320 Wagon
1989 300SE
1998 Range Rover 4.0 SE
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Old 09-08-2001, 09:10 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
You need to perform a vacuum diagnostic routine. This will check for vacuum leaks in the system.
Donnie Drummonds
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Old 09-08-2001, 11:59 PM
dpetryk's Avatar
Electrons can do anything
Join Date: Sep 2001
Location: Houston, Texas
Posts: 1,071
You probably need several if not all of the vacuum actuators replaced. I have only done it myself, never at a shop so I dont know the costs. The parts for the 7 actuators came to aaaaabout $250. A lot of disassembly to get them installed. The rubber diaphrams develop leaks and the system no longer works.
I got too many cars!! Insurance eats me alive. Dave

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