Yes the clutch is different on each style compressor. I've never replaced or adjusted an R4 clutch like yours, but a little googling should get the information you need. Measure the air gap with a feeler gauge and if it is wider than spec, find out how to adjust it. Even if you have to replace the clutch, it would be a pittance of a job as opposed to a correct compressor replacement procedure.

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

Annoy a Liberal, Read the Constitution

Good advice. It appears that the expansion valve is attached right at the drier, and easily accessible in the fender compartment, so we will do both. Thank you.

No, the expansion valve is in the glove box area inside. Don't touch it without a good set of tubing wrenches.

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

Annoy a Liberal, Read the Constitution

I replaced the compressor, drier, and expansion valve, and had the system recharged. The center vents are now inop. This seems like a common prob others have also had, but I have not seen any suggestions on troubleshooting or fix.

What say you my wise Peach Parts friends?

Thanks. Jeff

I see that this post is almost a month old, so by now you have probably figured out that the vacuum line was knocked loose from the pod controlling the center vents when the expansion valve was replaced.

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1985 300 TD 448K
1984 300 TD 278K

1983 240D euro 240k
1994 f-250 idi turbo 330K
1986 f-350 IDI
1987 F-350 IDI

1985 JD 1050 4wd
1965 IH 3660