The changeover switch is physically attached or connected to the driver's-side lever next to the console, just above the accelerator pedal. It is electromechanical and snaps into position to feed either the blower fan for heat or the squirrel-cage blower for A/C.
It's conceivable that the linkage may need adjustment to ensure that the switch goes through the required arc to engage the A/C or heater fans--or the switch may be in the middle position, with both fans disengaged. The relays for the compressor and other high-draw components are on the passenger-side cabin behind the glove compartment. I've found these to be very reliable.
The fuses on the firewall are for power windows and the supplementary fan but Mercedes sometimes used 16-amp fuses there for other optional equipment. They are prone to oxidation and frequently open the circuit even though they look fine. It does sound like the changeover circuit is malfunctioning--good luck
Tim Kraakevik
kraakevik@voyager.net
07-12-2017, 04:43 PM
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