R-134a Conversion - How did it work out?
Oct 28, 2020 | 06:04 AM
#21
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Joined: Oct 2019
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From: Huntsville, AL
That’s quite a big difference between your research and the FSM (7oz vs 4.1oz). I would follow the directions from the “instructions” pamphlet you get with the new compressor.
It is worth buying AC dye to add into your mineral oil. My first shot at refilling, I had a hole in the low pressure line, I was quick to notice due to the dye oozing out. Vacuum was good until I pressurized the system.
It is worth buying AC dye to add into your mineral oil. My first shot at refilling, I had a hole in the low pressure line, I was quick to notice due to the dye oozing out. Vacuum was good until I pressurized the system.
Oct 29, 2020 | 10:53 AM
#22
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From: Huntsville, AL
Little bit of an update on the AC project. I was able to verify that the total system oil charge is 7 ounces. I was able to drain 2 ounces out of my Denso compressor, so added back an ounce to bring it up to 3 (or 3.5 figuring that there was more in it than I was able to drain out by turning it upside down over a measuring cup). I will split 3.5 ounces between the other system components and call it good!
Oct 29, 2020 | 01:51 PM
#23
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Joined: Nov 2019
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From: SoCal
This is based on my one experience, I’m not an AC mechanic by any means but when I first charged my Denso Reman compressor with R134, the clutch would not engage. Had the truck at 1500 RPM, AC switch on, fan blowing HI. I read somewhere that new compressors will not engage without the proper PSI and the can did not provide enough pressure. So I manually engaged my clutch by wiring directly to the battery. Once the system took in one can, I plugged the compressor back to where it should, and everything else is history.
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