1991 F250 air conditioning R-134 oil

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F-250 [guest] from 10W40.com
1991 F250 air conditioning Posted 7-4-2003 00:24

I bought a kit to convert the air conditioner on my 1991 F-250 from R-12 to R-134. I would like information concerning changing the oil in the system. How do I get the oil out? How much do I put in? Any other tips would be appreciated.

[Guest]

to get the old oil out you would have to dissconnect the lines and flush out the oil. which needs to be collected per epa specs. you can throw in the r 134a most will come wil an oil charge. your sytem will probably take 6 -8 ozs. by adding extra oil you may decrecrease the performance of the sytem. also r134a builds higher pressures than r12. on a vahicle your age you runthe riska of developing leaks and blown hoses. worse case tour compressor seals leak or blows up beacause of the extra pressure.
ps