An expansion valve is a component that can over time deteriorate (it should be replaced when replacing a compressor). If it is stuck and cannot move to variably change the dimensions of the openings that pass through it, it can ultimately cause a catastrophic failure of the compressor.

In my case, I have tried several different refrigerants (BUT NOT 134a), and I have just rebuilt the compressor (parts purchased from acsource.com. I generally replace the expansion valve when the system is opened up (at $28.00) better safe.

I just checked pressures this evening and it appears that everything is working quite well with my latest repair (with the AC, however, it is generally short lived).

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Jovan

'84 (11/83) 190D 2.2 5-Speed; Silver/Blue; Motor No. 00354, 402k mi (340+kmi mine)

'89 Porsche 911 Turbo Coupe; Black/Black; 53kmi
'05 BMW 530i 6-Speed; 302kmi
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