Good Morning Michael

On the AC problem double check the harness connections at the compressor!

I believe if you disconnect the blue two pole switch located at the forward part of the intake manifold (beneath removable black cover) your aux fans should engage at high speed. If you bridge (connect the two wires together) the red/green switch located on the receiver/drier the fans should engage at low speed. On the 124.034/036 models the fan relay is a double size relay (located in fuse panel assembly) and it is absent of fuses (I am viewing the diagram at this moment). There is a fuse located outside the main box. Fuse 16 powers up the fan relay, the external fuse powers up the fans through the relay. The relay utilizes a ground signal via the pressure switch (when closed) at socket 4 of the relay harness connector and a ground signal from the AC pushbuttons to socket 2 of the relay harness connector when conditions are met.

The relay harness connector will have two 6-pole connector assemblies (x1 and x2), some of the sockets may not have electrical connectors. The relay will have the following markings on the plastic housing surrounding the pins:

87b-output for Fan High

87a-output Fan Low

15(85)-input from fuse 7

30-input from external fuse

Relay basiscs:

85-power for relay/solenoid

86-ground for relay/solenoid

87(etc)-output to device

30-power for device

Hopefully this information will help you resolve your fan problem, if not let us know.