Automotive Air Conditioning Information Forum

Captured o-rings are just a little thicker. Think of it like an old A6 compressor. There are #12 o-rings for the hose connections. And #12 for the back of the compressor, which are thicker, "captured".

So I may need an O-ring WIDER than the green one shown in this photo that I used, where the ...

This morning already, before I depart for Prescott, I used aerosol brake cleaner and brushes to clean up the top of the compressor and the fittings, then washed that off with water. Then I took the truck to Home Depot and used the AC. When I returned, I saw a small ring of dye around the bolt ...

Update:
I purchased a new/better UV light and goggles, and got down to Phoenix to take a look. The Frontier appears to have significant dye on the top of the AC compressor. I had replaced the high-pressure line in 2017 with the only available one, which had compressor fitting 5.5mm longer than the ...

msrichmond wrote: Fri Sep 05, 2025 2:30 pm What size O-ring should be used on an oil filler plug? My local shop tech says there is a leak there.

Once the refrigerant has been recovered, simply unscrew the plug and match up with a new green NBR O-ring. O-ring seal plugs and fittings should not be overtightened.

JohnHere wrote: Sat Aug 30, 2025 12:25 am Does your vehicle take R-134a or R-1234yf?

I believe all 2015 vehicles had R134a.

Disclaimer: I'm NOT an AC professional.

You should post more information. My wild-ass guess is that since it cools at higher rpm, the Kia is moving along the road at that time. I wonder if your electric fan/fans moving air through the condenser and radiator are working...sounds like it could be an ...

I didn't see the site glass,I did look for one.



I have my CFC UNIVERSAL license so I can buy what I need.

See above about knowing correct refrigerant level in a system. Even with R-12 and a sight glass , adding correct amount of R-12 can be tricky.



Why exactly did you bother to post ...

Disclaimer - I'm not an AC professional.

That stated, I do still have a vehicle using R-12, and I live in Arizona.


I bought tonight a 1981 Corvette with 4600 original miles.

1. Being blunt, if you just bought a pristine 1981 Corvette, you can afford to buy a REAL R-12 service gauge set. If ...

Rogermija wrote: Sun Aug 17, 2025 5:57 am Static pressures are about 80 psi indicating reasonable charge.

Not, so fast, grasshopper !

JohnHere wrote: Sat Aug 16, 2025 2:10 pm Diagnosing the system can't be meaningful unless the system is fully charged according to the manufacturer's specifications

Rogermija - Static pressures are just one data point.

Your 1991 GM will need an adapter for the high side fitting, as government required smaller fitting on high side by then to minimize hooking up R-12 service gauges incorrectly, like Gomer did.

Of course there was a Ford-type adapter (Ford, Mazda) and GM adapter (GM, Toyota).......