How to wire up old 58-60 evaporator without thermostat???

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davidh73750
Posts: 12
Joined: Tue Jul 07, 2020 4:11 pm

How to wire up old 58-60 evaporator without thermostat???

Postby davidh73750 » Tue Jul 28, 2020 3:51 pm

Okay. So usually on aftermarket underdash ac the red wire to fan goes to the ignition, green wire goes to binary or trinary switch , then to compressor.

This old Mark IV has no thermostat. I recently bought a service manual for Mark IV ac. I found the wiring diagram. (See pictures) When I look at the temp control it looks like a huge device into the evaporator core without power connected.

I have 2 of these & both have the fan wire connected. (See picture) The only wire loose is the brown wire that’s supposed to go into the clutch fan? How do I wire this thing up? I want to go with a sandon style.
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davidh73750
Posts: 12
Joined: Tue Jul 07, 2020 4:11 pm

Re: How to wire up old 58-60 evaporator without thermostat???

Postby davidh73750 » Tue Jul 28, 2020 3:57 pm

This is the common method for wiring most all aftermarket evaporators.
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davidh73750
Posts: 12
Joined: Tue Jul 07, 2020 4:11 pm

Re: How to wire up old 58-60 evaporator without thermostat???

Postby davidh73750 » Thu Aug 06, 2020 6:37 pm

I hooked the brown wire up as the fan. Still not sure what runs to to the compressor side.

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