My 90 d350 had a faulty clutch cycle switch, not really available anywhere. I spent all day yesterday reading about every9ne problems and how the Jerry rigged this or that or swapped this or that and made it work. Some simply bypassed it and worried/ didnít worry about a froze up evaporator others used switches solenoids, and some just added a bunch of wire and a toggle switch.
I not a purist but I didnít want to start hacking and changing anything for what I thought should be a simple fix óó and it is.
What you need
Two female spade connectors (less than $1)
One Murray 35720 temp switch (available at orielly/ checker $13.99)
What you do
Remove your old clutch cycle switch
Cut the three wires where they enter the switch housing
Cut the middle wirenear the plug (not needed)
Bolt the new switch in the the same bolts the original switch was mounted
Put a spade connector on each of the two remaining wires
Plug spades onto new switch
Reconnect original plug to harness
Turn the truck on an dit should work like New
I donít know if this would work on the newer trucks that the pcm controls a/c but it works on the 90 with NO modification to the original harness