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Is It Still Cold?
What you may have is a low refrigerant pressure that isn't opening the pressure switch anymore. Is your compressor actually running? I have the same problem, and when the pressure switch is bypassed, the compressor kicks on, and I also get air through the center vents, so it may not be a vacuum problem after all.
But then, the AC in your '79 300D may be quite different from my '82 300SD system...
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"We drive into the future using only our rearview mirror."
- Marshall McLuhan -
Scott Longston
Northern California Wine Country...
"Turbos whistle, grapes wine..."
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