The car is a 1987 TD

The Mercedes shop - a very very well respected indy shop here in Northern Va - has had my car for over a week now. I brought it in because the A/C was blowing hot once again. Well the clutch on the compressor was fried. Mercedes warrantied the compressor, they put it on, and filled with R12.

Now this is the 3rd compressor I'm on so they wanted to keep the car and drive it for a while to see why they keep going bad. Today i spoke to them and apparently at idle the pressure on the hide side is fine, right where it is supposed to be. But once the car gets going and the tach hits 2500 RPMs the pressure reads at 325 psi and hits 350 psi at 3000 RPMs.

They seem stuck at this point on how to get the pressure down. I trust these guys completely - they have done great work on the car and are always honest with everything. Just curious if any of you guys have ever experienced this and if so what your solution was (if any). Thanks.

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87 300 Touring Diesel - 197K
Bosch Euro Corners