$20 20 minute a/c clutch cycle switch repair no major mods 1990 - Dodge Cummins Diesel Forum
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post #1 of 3 (permalink) Old 05-31-2018, 05:43 PM Thread Starter
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$20 20 minute a/c clutch cycle switch repair no major mods 1990

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

https://www.facebook.com/media/set/?...1&l=08119c90cd


1990 ram D350 dually 12v automatic
2001 ram 2500 quad cab 4x4 24v automatic
1970 Chevy suburban 12v 5spd 2002 dodge chassis <project>
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post #2 of 3 (permalink) Old 05-31-2018, 05:52 PM
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Quote:
Originally Posted by moonshadows View Post
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
https://www.facebook.com/media/set/?...1&l=08119c90cd
Isnít the factory switch a pressure switch? You say to remove that so Iíd assume that drains all the refrigerant?
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post #3 of 3 (permalink) Old 05-31-2018, 06:25 PM Thread Starter
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No, leave the low pressure switch alone this is for the electronic clutch cycle switch as pictured (click the link)
It is a small black box with five wires coming out of it two go to a plug and three connect to the harness. If you have an intercooled truck it might be different

1990 ram D350 dually 12v automatic
2001 ram 2500 quad cab 4x4 24v automatic
1970 Chevy suburban 12v 5spd 2002 dodge chassis <project>
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