Tests complete as far as able today; the problem has to be in the switch, the adjustment of it, or the wiring from the switch to Klima.

1. Throttle-linkage-mounted microswitch DOES NOT switch at full throttle, at least not as measured at Klima pin 4 (VL terminal).
2. If pin 4 is manually grounded, a/c compressor switches off, so Klima and compressor are working correctly.

Looks like I need to pull the intake manifold and attack the switch directly.

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970