AC Does not work after swap

Completely done with swap, only issue is AC will not work, compressor kicks on but is not cooling, only thing different with a/c system is I tied the trigger wire for the fans onto the green wire on the compressor clutch, any suggestions, it was blowing ice cold before and does not need any freon

Are you sure the a/c door is open? The 1991 was notorious for bad a/c control parts inside the truck. The blend door will quit working and the control panel on the dash will quit feeding data to the control motors. Feel the lines, one side should be cold and the other should be hot.

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Originally Posted by 1991SSP

Completely done with swap, only issue is AC will not work, compressor kicks on but is not cooling, only thing different with a/c system is I tied the trigger wire for the fans onto the green wire on the compressor clutch, any suggestions, it was blowing ice cold before and does not need any freon

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Mine is doing the same thing. I tied to the clutch wire just like you did. I thought my mind was playing tricks on me.
Mine is cool but not cold. BTW im using dd mount.

Tieing into the actual clutch wire is a no-no. Tie into the signal wire from the PCM or the clutch relay behind the glove box for a signal to trigger the fans.

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Originally Posted by RedHeartbeat

Tieing into the actual clutch wire is a no-no. Tie into the signal wire from the PCM or the clutch relay behind the glove box for a signal to trigger the fans.

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Red, do you know what color wire it is on the relay>?> My truck is a 1994 model, all the doors are working, switches from floor to dash, none of the lines on the system are getting cool

nope, go behind the glove box and see if you have a bank of 3 or 4 relays. Ones of those relays triggers the a/c clutch. Tie into the trigger wire, not the signal wire going to the clutch.

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Originally Posted by RedHeartbeat

nope, go behind the glove box and see if you have a bank of 3 or 4 relays. Ones of those relays triggers the a/c clutch. Tie into the trigger wire, not the signal wire going to the clutch.

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Ok, I'll give it a look tomorrow, thanks for the info

Let us no how you make out i will be doing this soon.

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Originally Posted by RedHeartbeat

Tieing into the actual clutch wire is a no-no. Tie into the signal wire from the PCM or the clutch relay behind the glove box for a signal to trigger the fans.

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Whats wrong with doing it like this? Not trying to contest you.. but i actually have mine that way.. tying into the green clutch wire i mean

Introduces corrosion into a load bearing wire and if you cut any strands of wire under the insulation you put resistance in the wire.

I also hooked a signal wire to my fan relay to the green wire. The problem i noticed was when i wasn't running the AC and the fans kicked on it would engage the AC compressor. It was caused from the voltage coming from my fan thermostat signal to the relay would cause it to happen. Then my compressor went out so I've never messed with it any more.

Turns out my AC system was full of air, how in the heck it cooled like it did before the swap I have no idea, friend recharged it for free, gonna run it and see how it goes,,, when I tapped onto the green wire on the compressor I soldered my wire and wrapped with tape, then covered it with loom and taped it again,,,