Can anyone help with me with my AC? - Toyota Yaris Forums

06YarisRS · 07-02-2019, 10:05 AM

You will want a manifold gauge setup. You need to be able to watch high side and low side pressures and how they relate to each other to make a diagnosis. Low side pressure alone will tell you nothing, especially if you have adequate pressure there. Those single shot recharge kits are, imo, the wrong tool to use for a properly operating A/C system as they only allow you to see part of the picture. I knew sweet FA about A/C, but with a bit of reading and practice, I've evacuated and recharged my system twice (once as I swapped my engine and again as I had a faulty used compressor), plus adjusted and temperature corrected refrigerant levels. It seems complicated, but it's actually pretty easy.

Once you have a manifold gauge set, here are a couple docs to refer to. If you're using 12A refrigerant, I believe it takes a lot less than R134 to reach spec pressures. The pressures in the charts below work for both 134 and 12A. And, the refrigerants are compatible (confirmed by a couple of A/C shops), but I did a complete replacement rather than blending refigerants.

07-02-2019, 10:05 AM	#4
06YarisRS View User's Garage Drives: 06 2ZR Turbo Yaris RS Join Date: Aug 2017 Location: Fredericton, New Brunswick, Canada Posts: 2,384	You will want a manifold gauge setup. You need to be able to watch high side and low side pressures and how they relate to each other to make a diagnosis. Low side pressure alone will tell you nothing, especially if you have adequate pressure there. Those single shot recharge kits are, imo, the wrong tool to use for a properly operating A/C system as they only allow you to see part of the picture. I knew sweet FA about A/C, but with a bit of reading and practice, I've evacuated and recharged my system twice (once as I swapped my engine and again as I had a faulty used compressor), plus adjusted and temperature corrected refrigerant levels. It seems complicated, but it's actually pretty easy. Once you have a manifold gauge set, here are a couple docs to refer to. If you're using 12A refrigerant, I believe it takes a lot less than R134 to reach spec pressures. The pressures in the charts below work for both 134 and 12A. And, the refrigerants are compatible (confirmed by a couple of A/C shops), but I did a complete replacement rather than blending refigerants. __________________ 2006 Yaris 5 Door RS 2ZR-FE (2011 Corolla 1.8L) Swapped, Automatic, T-28 Turbocharged (8 psi), HSD MonoPro Coilovers, DIY W/M Injection, custom 3" cold air intake, custom 2.5" exhaust, TRD rear sway bar, Penguin Garage 13mm spacers (rear), custom Civic front lip, full repaint, Android 6.0 7" touchscreen, Rockford Fosgate speakers, tweeters, NVX underseat subwoofer https://www.instagram.com/2zr_turbo_yarisrs/ Last edited by 06YarisRS; 07-02-2019 at 10:31 AM.