[donleck]

Hello,

I have a 1994 Chevy s-10 blazer which was originally an r12 system. I brought it to the auto shop last year and was told that this would probably be the last year that I could get r12 from this shop. It is too expensive and he will not be buying another bottle of r12 when his runs out. I decided to have it changed over to 134a. 3 reasons 1) its cheaper $$ 2) I could do it myself $$ 3) the shop was not going to carry r12 anymore and this is becoming the trend. After the coversion (2 weeks later) the compressor went bad (ball bearings went). I brought it back to the shop because I thought he did not put enough oil in the system. He stated he did and that r134a conversions do this all the time. An r12 compressor is not designed for 134a and these coversions never work after a year or so the bearings always go mine just went sooner. Well I replaced the compressor and went to another shop, they stated the r134a is fine in an r12 system so I had them evacuate and refill the system with r134a. When I run the AC I get a little bit of a whinning noise w/ a metal rattle when the AC is on and it goes away when the AC is off. First what does anyone think of r12 to 134a coversions. 2nd should I add an extra ounce or 2 of oil to the system to help protect against the bearings going again and maybe solve the metal rattle/whinning when the AC is turned on???

Thanks for the replies.