Thread: 81 300sd climate control issues
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Old 01-16-2018, 07:36 PM
SD Blue SD Blue is offline
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Join Date: Jun 2004
Location: West of Ft. Worth. TX
Posts: 4,186
I believe the brown vacuum lines are for engine shut-down. Are you having any issues in that area?

Mono-valve is tied directly to the fuse so it should have constant power. MB switches the ground side for control. Mine has stuck closed in the past so that may be the problem with it. It should default to full heat when disconnected, I believe.

That connector may be for the power antenna or fader, I'm not sure.
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Sam

84 300SD 350K+ miles ( Blue Belle )
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