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A/C conversion
First,,If you have R-12 and it is working........ Keep It.....
To convert to R-134 in a Chevelle. You need to change "" 2 "" items. 1--Have your POA valve adjusted for R-134. 2--If you want to have the SAME TEMP. as a late model auto. I would change to a paralell flow condenser, WHY? R-134 Builds up more heat than R-12. SO,, The old style round Appx. 3/8" dia. tubes. The difference is,, The old round stock org. Condenser does not have enough Sq. In. of cooling surface to cool down R-134. NOTE: If you can keep you Chevelle moving at 35 MPH. or above, The condenser will recieve enough air over the tubes to keep you at 43 degrees. Under 35 MPH a 60s-70s stock condenser is not efficient. My 70 Sta. Wgn. SS468 driver blows 43 degrees out the center vent at ALL TIMES when the A/C is operating. ( Parked in the sun on a hot day or driving on the I-State). A 1970 C-60 A/C calls for a 60 Oz. charge. I use the 80% rule for R-134. I charce my R-12 60 OZ. system with 48 OZs. of R-134. The ONLY "" 2 "" items you need to change are 1= POA adjusted fo R-134.... # 2 For good cooling I would change from the factory TUBE cond. to a P. Flow condenser. P.S. If you get an Aftermarket A/C unit you will be using a P. Flow Condenser. The G.M. unit in your car is BETTER than ANY aftermarket unit that money can buy. BAR NONE ! I would stick with a O.E.M. unit if possible. Again being KOOL is not cheep ! Bob |
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