Check the strip fuse. It's a 30 amp fuse. I know in a 126 it is mounted near the main fusebox, but not in it. In that case, it is in a separate little rectangular holder.

The fuse is just a little strip of metal, and as it wears out it can become intermittent only working when the two pieces decide to touch.

When you hit the engine compartment with air, you nudged the fuse just enough to make the two withered ends touch. But, because they are so burned out, no real current can pass and your CCU goes nuts with the clicking, etc. until the rest of the fuse burns up. I will be very surprised if you don't report back that this was exactly the case.

I was able to get one for $5 at the VW dealership (MB didn't have it).

Symptoms are a completely dead CCU, no blower.

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition