Finally gonna do the swap.
 

Putting in a 5.3 and 4l60e in my 1971 Chevy pickup within the next month or so.

I do have a question about AC.

It's not an AC cab, it has an aftermarket under dash now. I don't know if it works since it leaked out the refrigerant.

Should I try to get the compressor from the donor to work by having it controlled by the pcm or just go with a new aftermarket under dash that controls a second fan when it's on?

I don't want to cut the frame to do the conversion if I don't have to.

Donor is a 2004 Chevy suburban.

Re: Finally gonna do the swap.
 

others can answer this better...but i think id want a complete unit instead of mismatched parts...im pretty sure youll have to use i high mount compressor though

Re: Finally gonna do the swap.
 

On my sons 70c10 with factory AC I was able to get the stock AC compressor to fit in the frame rail without having to cut anything. I did however have to build custom refrigerant lines from the stock 2011 Denso compressor to the 1970 factory AC system. I did keep the truck R12 as I still have a bottle. I did have to disassemble the stock compressor and flush out all the prag oil that is used in the modern r134a systems and add mineral oil for r12 since r12 and prag oil don't mix!!!. But if you are using r134a you don't have to flush unless you think it is burnt or contaminated. You can connect the swap compressor to your AC system and it should engage just like any compressor on any AC system.
Oh and for some info I swapped in a 2011 LC9 with a 6L80E package using ECE pedestals and clam shell mounts with the ECE trans mount I bought in a kit.
ECE =Early Classic Enterprises, Fresno CA