Yes, it is a big project, but it's hard to say just how big.

It is quite common to replace the TXV in the case of a catastrophic compressor failure due to debris commonly collecting in the restriction.

IF you were able to flush the components leading away from the compressor and find that they are SPOTLESSLY clean, then you might get away with letting the TXV be, but with the compressor locked up, the chances of that being so are EXTREMELY low.

Start when you flush the components, put a white towel or paper towel over the outgoing end of the component to filter so that you can see if debris is coming out. It might only be a fine powder, but that is enough to wreck your new compressor.

You might also invetigate putting in a suction side filter. This is an aftermarket filter that goes just before the inlet to the compressor to catch whatever might be floating around. You can not do this in lieu of the flushing procedure because it can then easily plug up.

I've never changed the TXV in one of the big cars but I understand it is challenging. Just make sure you use a back up wrench and preferably tubing wrenches to prevent buggering up the nuts.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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