I bought a new expansion valve because of the possible incompatibility with the 134 refrigerant. We are going back to the old R12 and I am putting on a new valve and a new compressor.
Would the thermoswitch at the drier cause the auxillary fans to not come on or would it be the AC temp switch on top of the drier? How could I test either of these switches.
We still get cold air from the vents if a big shop fan is directed over the auxillary fans.

This sounds a lot like the question you posed on another thread. Is your question answered? BTW, there are no temp switches on the drier, only pressure switches. One of those switches (probably red in color) works the aux fan(s), the other (black) works the compressor.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't