Hello all. Does anyone know how to test the ac high/low switch? To be clear this is the switch on the receiver dryer with 3 spades. I think mine is bad as my fans are not coming on when the ac is on....but the fans do work when I put 12v directly to the fans. Thanks in advance.

You can easily see the actual value that sensor is sending to the a/c pushbutton.

Try searching for how to read those actual values or send me a e-mail & I will supply that info to you.

__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator