scotch
+1y
Just start at the compressor (including the mounts) and follow the lines and wires all the way back to the evaporator. You will need everything along the way. You might need to get the power steering mount as it serves as the lower mount for the compressor if your trucks isn't already set up that way. There is a separate upper mount as well. Others can chime in on the details and differences..
Here are a few other tips...
You can leave the receiver/drier (cylindrical piece with sight glass) because you will want to install a new one - don't reuse the old one.
Wiring - get all of it. The harness should unplug from the truck harness behind the glove box. So you shouldn't have to cut any wires. These systems were installed at the dealer by just plugging them in. So you can unplug it from a donor truck and plug it in to yours. No cutting/splicing.
Pushbutton switch - make sure to grab that too.
There is a large oval grommet in the firewall where the lines go through. Get the grommet and the metal cover plate!
There is a grommet for the evaporator drain tube. Get that as well. The wiring will pass though it also.
Make sure to get the metal "band" clamps and screws on each side of the evaporator case. Your truck won't have them.
Also, the wiring for EFI trucks is different than carbureted truck. To try to pull a system from the same type of truck you have. EFI trucks have a relay mounted on the inner fender. Get that as well with the wiring (if you are pulling from an EFI truck.)
I would probably install a new expansion valve as well.
I don't remember the sizes off hand, but all of the line fittings can be separated with the right size wrenches... OR, bring a pair of crescent wrenches. You want to have a grip on both sides of the fittings, or else you'll be twisting the lines.
It's all pretty easy to remove, clean, and reinstall. Use new o-rings everywhere (134a type if converting.) The biggest knuckle busting part will be pulling the power steering mount.