1995 Chevy Cheyenne My air conditioner needs to be re-charged

1995 CHEVROLET CHEYENNE
103,800 MILES • V8 • 2WD • AUTOMATIC
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1995 Chevy Cheyenne mileage: 103,800. My air conditioner needs to be re-charged. It has the old type refrigerant so it needs to have the new type put in. Problem is my local garage said the manufacturer recommends not doing this. But their computer tech manual gave no reason why. Why does GM recommend not doing this? If I have it done, will it cause problems with the AC unit? If I can't have the new style refrigerant put in where would I find the old type? (I don't think it's made anymore)
Dec 3, 2010 at 10:25 PM
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Your vehicle can be changed over to the new type of refrigerant (134a). However, you must remove as much of the old compressor oil as possible first and replace it with the new type compressor oil before adding the new refrigerant. Compression failure could result if this procedure is not followed.
Dec 3, 2010 at 10:27 PM