BENZ-LGB,
Actually, It's been fairly quiet here today, so far. Ran some errands after church, and traffic was light.

Gotta be a hose loose (or plugged) between aspirator motor and sensor. Motor definately has suction? Not a loose impeller on the motor shaft? My hose in the "A" pillar is fairly stout rubber, but maybe with the heat here recently, yours has collapsed?

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)