Originally Posted by Rick Hall

Well, I'm going to put my .02 cents in here. I always question why SOME people are always quick to modify a system from its original design and then suffer the consequences, often, unfavorable. The Mercedes Benz a/c system will NOT function as designed when converted from R12 to R134. As all the real mechanics and technical people on this site know, it just doesn't work AS DESIGNED. I have had NO problem with getting my R12 system charged/repaired at my local dealer. They have the equipment and expertise to maintain this sytem as it was intended to operate. R12 IS available for sale and as mentioned in earlier post, it is not illegal to use. I think the last 5 years it has cost me about $135 each time I needed to charge the system for the hot summers here in Texas. I purchased a 30lb bottle of R12 for $150 this spring and am now able to charge my system. I replaced all of the hoses and o-rings in the system, installed a new receiver/dryer and expension valve and can chill my beer and fog my glasses rather quickly now. Other members in the local MB club that HAVE converted, when pressed, will state that "it's not the same but close" about their conversion to 134. If you can't afford to do it right, maybe youcan't afford the car! Just my thoughts, not everyone will agree. BTW, '91 300E, 189K with the ORIGINAL a/c compressor AND R12!! BRRR, its COLD!