Thread: 12V to Monovalve--AC or Heat--Bad CCU?
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Old 10-09-2009, 07:22 PM
Cr from Texas Cr from Texas is offline
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Join Date: Feb 2008
Location: DFW area (north side)
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Sounds like a vacuum issue. The default mode on the dampers is defrost. Unplugging the electrical connector at the mono valve gives you full heat.
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1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/showthread.php?t=296386
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