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Old 08-14-2006, 12:09 AM
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Join Date: Nov 2004
Location: Austin, TX - Hook 'Em
Posts: 113
Newbie Help! Servo/vacuum replacement/repair advice needed!

Being very new to working on cars (I am learning as I go on my '80 450sl), I am looking for some advice and direction on where to begin fixing my A/C servo and Vacuum issues.

Quick background...something has been draining my battery over the last year or so, and finally, today, I was able to narrow it down and confirm that the draw is coming from my A/C Servo. That being said, I am ready to begin fixing the car, but I have been reading a lot about this and see that the servo and the vacuum are very closely related and have a lot to do with each other. My car also seems to have a vacuum leak, so I was going to look and try to fix that as well.

With that in mind, I am not sure how separate the two issues (vacuum and servo) really are. When I go to fix the servo, will I end up fixing the vacuum by default as well, or is it possible to fix the servo without fixing the vacuum (or vice versa). Basically, I am just looking to know where I should start, and what general direction I should head in getting my baby all fixed up.

Any help/advice is greatly appreciated.


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Old 08-14-2006, 12:26 AM
Registered User
Join Date: Aug 2004
Posts: 232
Vacuum and the servo overlap insofar as your AC goes. You can definitely have separate issues with vacuum in your door locks, but those are on a separate circuit.

Fixing your servo will not necessarily fix your vacuum isssues. What are your vacuum issues, anyway? No center vent air? All heat and no cool?
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Old 08-14-2006, 12:44 PM
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Join Date: Jun 2005
Posts: 20
450 SL vacuum

Hi Zack,

Sounds like your Servo is stuck and you're correct, you'll need to address that, but you will have also need to track down your vacuum issues in order to get your A/C working properly. We've got simple, yet detailed vacuum diagrams that may be of help to you on our website, where you can also learn about our upgrade to the OEM AC Servo. We've got lots of experience with the vacuum system on your vehicle - feel free to give us a call or email on the specifics.

Good luck with your repair.


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