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Here's a long shot - do you have the center vents pointing directly upward? If so the cold air fools the temp sensor near the rear view mirror and the A/C system cycles accordingly by thinking it has reached the set cabin temp. The hot air coming out after sitting doesn't surprise me, my car does that too and my A/C works fine. Could be the hot engine heating the duct work and air left in there. Never saw such a detailed set of pictures of a monovalve before. Thanks.
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dtf
1994 E320 Wagon (Died @ 308,669 miles)
1995 E300 Diesel (228,000)
1999 E300 Turbodiesel ( died @ 255,000)
2006 Toyota Tundra SR5 AC 4X4 (115,000 miles) rusted frame - sold to chop shop
2011 Audi A4 Avant (165,000 miles) Seized engine - donated to Salvation Army
BMW 330 xi 6 speed manual (175,034 miles)
2014 E350 4Matic Wagon 128,000 miles
2018 Dodge Ram 21,000 miles
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