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Old 07-22-2013, 03:44 PM
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Doktor Bert Doktor Bert is offline
Das Sturm Uberdoktor
Join Date: Jan 2005
Location: Palm Springs, CA.
Posts: 2,670
Originally Posted by Zacharias View Post
Defrost-only working is the 'fail-safe" default on that system, meaning that some major part is not working. It isn't likely that a vacuum fault alone is responsible.
On the ACCII system, Everything is based on vacuum, including when the A/C compressor doesn't engage and when none of the buttons on the panel recat when pushed. about vacuum.

ANY vacuum loss whatsoever and the system won't come on in any mode but defrost.

You need a vacuum gauge and the diagram posted in the link above to check for vacuum leaks.

Email me via my profile if you need tech support. I've been driving a 300SD with ACC II for over 20 years....
Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013

100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership
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