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Discussion Starter · #1 ·
I'm curious what is the size of the high side fitting on the A/C is of a 91 S10 with a 4.3? My gauge set screws on to the low side but the high side is smaller. It's showing pressure on the low side but the compressor is kicking on and off real quick so I figure it's a little low. I have a can of R12 I've had for years so that's not an issue getting. I know I can charge it with just the low side, but I'd like to see what pressure the high is at while I'm charging it.

Thanks,
 

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i saw what you did there!
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3,573 Posts
im pretty sure the fitting that is not on the canister is the high side

and the one on the canister is the low fill side


i can check on my 91 again to make sure of that
 

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Discussion Starter · #3 ·
Thanks, but I knew which was one was the high side I was trying to find out what size that fitting was so I could buy some kind of adapter. I may just buy the R134 conversion fitting and just use that quick coupler to attach the high side to my gauges.
 
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