I have a 16v. I know the compressor on mine is different (higher reving engine) but I am guessing the rest is similar if not identical.

My manifold was leaking and had to be replaced. Went looking all around town for someone to do the work. Ended up taking it to MB. They convinced me to go with 134 on the new system. I was told up and down that R134 would give me the same if not BETTER cooling than R12. The shop manager even told me this (I have dealt with him quite a bit over the last several years). So I took the plunge.

After I gave them $2,100, they gave me my car and I'll be damned if that thing does not freeze my ass off. The highest I have had the fan on thus far this summer is the second speed. It has already hit mid 90's here in DFW and I am very satisfied.

The shop manager and the head tech there both told me that the biggest problem with conversions is people put the same amount of R134 in as the manuals say for R12 and the system is not designed for that. R134 expands more and there fore needs more room in the system. I think he said you are supposed to use 20% less or so. Any way, he also told me that R134 works at a lower pressure so there is less stress on the system (I figured on a 20 yr old car that cannot be a bad thing).

Bottom line is I have had the car back for a month now and I am very happy with the results. Seems to me that there is a good possibility that the folks who are having problems with 134 did not have the work done by someone who knew what they were doing. JMHO.

Good luck.

__________________
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2014 C250 21,XXX my new DD ** 2013 GLK 350 18,000 Wife's new DD**

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- God is an ever receding pocket of scientific ignorance that's getting smaller and smaller as time moves on..." Neil DeGrasse Tyson
- You can pray for me, I'll think for you.
- When you understand why you dismiss all the other possible gods, you will understand why I dismiss yours.