Verify the compressor RPM. With the diesel engine's narrow operating range, swapping engines & compressors can lead to a mismatch. A compressor that is too small or spinning too slowly will give poor cooling. The OEM compressor for your truck was a 210 cc/rev York type compressor. If you install...

And the good old jumper wire kills another compressor. That little wire sells a lot of parts. No you get to guess how much of the compressor metal went down the discharge line as it ground to a stop. Your compressor is seized from a lack of lubrication return, Running when the system said it should ...

A lot depends on what you find in the dryer.

If it has a pint of oil in it, then you may need to flush the system.

If it is bone dry, you need to look at the condenser.

Well, 2 compressor, same tensioner. Same noise.

I hate to just throw parts at things, but given the price of a tensioner assembly (under 50 bucks) and the ease of replacement ...

Still sounding like the hydraulic tensioner leaks down over time when not in use. Once it is cycling it is ok.

Does the vehicle have rear A?C?

Standard block type expansion valves in both systems.

Sounds like it has 2x the oil charge, some sealer and is overcharged on refrigerant as well. Time to take it apart. Recover the system. Look at the expansion device first. Post a pic of whatever is stuck on it. Then drill the accumulator and drain it. Remove the accumulator, drill the bottom of it w...

What exactly is an "mgm"?

It sounds like a coupler malfunction. Low side.

Those grooves were the "barbs" . Just like some of the fittings in the links I posted. Yes, you can Tig weld an aluminum beadlock fitting to the OEM aluminum pipes. I have done it in the past, but it it a one shot deal. Once the beadlock is crimped, you are done. I think as complex as the ...

Barrier hose will be a snug fit, but it should be anyway. A little lubrication is a good plan for sliding them on. If you can't find a loose ferrule with the correct dimensions, you can use clamps. We have covered this before: https://www.autoacforum.com/messageview.cfm?catid=2&threadid=13152 ht...

Your RX7 uses a block type TXV, so the low side switch can keep things from operating when it it either too cold outside, or the system is severely undercharged. Both of those conditions can keep oil from returning to the compressor. An adjustable low pressure switch will do what you want. You can s...