1991 350SD - AC (Air Conditioning) and center vents not operating mystery - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 07-29-2011, 01:07 PM Thread Starter
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Date registered: Jul 2011
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1991 350SD - AC (Air Conditioning) and center vents not operating mystery

Hi all,

The AC and center vents on my neighbors 1991 350SD quit.

The AC has a full charge and the fuse is OK. If the low pressure switch terminals are touched together, the compressor will still not click on. Is there a relay that I am missing?

Also, the center vents on the 350SD are not operating. If i remember from looking at oie in the boneyard, there are some electric/vacuum switches behind the push button panel. Are these a source of failure?

This is quite different from my servo based 300TD ACC!

Any help is appreciated! Thanks!
mattmondo is offline  
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