GMT400 HVAC swap

[John-e Bravada]

Similar to Valyidol's post, I didn't want to hijack his, I'm trying to fit a 96' HVAC system into my 86'. I had to hack my trans tunnel and remove my engine bay side of my 86' Crew Cab HVAC. The GMT400 system is almost all under the dash, electronically controlled, and a lot cheaper then a Vintage Air setup. With my Cummins swap I also don't have a vacuum source. I realize the lines will be custom to go between the GM condensor and the Cummins compressor and evaporator but I'm hoping I can make it work. The GM compressor looks like it might bolt to the Cummins... Maybe I can use all GM components.

I'm looking for help on how to remove the GMT400 system and if it will fit in a square body dash. I'm not apposed to cutting and modifying.

Any help/pics would be appreciated. I'll detail my progress as I get into it.

 

[bluex]

I read on Facebook about someone using a setup from a Colorado. The box is smaller an all self contained an all cable operated. Might be an easier solution?

 

[John-e Bravada]

I might have to look into that. I had a GMT box lined up but it looks like that fell thru. I have to go quite a ways to get to a good u-pull-a-part but maybe I'll have to take a day and look over a bunch of different vehicles. The hot rod guys talk about using compact car units but I don't know if they would put out enough to cool/heat a crew cab. I'll have to see what else is totally under dash and electronically controlled.

 

[John-e Bravada]

I found a new pull-a-part locally and checked them out this weekend. Almost all of the American cars and trucks there were vacuum operated. The compact car units spilled into the center console. So I ended up with a cable operated under dash unit out of a 1994 Isuzu Trooper. I hope it fits. It was the smallest import(non vacuum) unit I could find. This is going to be a pain to make work but I don't know another way around it. Wish me luck!