I responded to the other thread too. I found the problem to be the vaccum source line for the climate control that connects to the intake manifold, it had come off, therefore no vacuum supply for the air distribution system. Cost was free

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record