Sam's Club has cases of 12 cans of Johnsen's brand for $100. Not a super fantastic deal, but pretty much buy 10 get 2 free at Walmart prices for Supertech.

Here's a nitrogen pressure calculator. I have found that it follows what Fieldpiece uses for their temperature compensation in their gauges for their "tightness test."

https://www.oceanhvac.com/nitro.php

Interesting. I guess the back-up rings are my next thing to try if it starts leaking again. My old factory hose shouldn't have had wide grooves though. I wonder if the cheap o-rings could be made to meet an inside and outside diameter specification while being sort of oval so that they aren't as thi...

bohica2xo wrote: ↑Tue Aug 01, 2023 11:11 am Any chance you have the removed components and a pair of calipers to make some comparative measurements?

Sadly, I tossed the old parts after last summer's work.

I'm a little concerned about the pressure switch, because I never noticed the compressor cycle on and off. However, the high pressure never seemed to get out of range enough to cause it to. The factory service manual has a kind of confusing chart about what it should be doing. If I unplug it, the co...

I just recharged it. Here are the gauge readings at 1500 RPM. These match almost perfectly to my notes of how it was running in June 2022 when I replaced all of those parts. https://i.imgur.com/1UVpP2n.jpg At 1500 RPM, I was getting about 52F out of the vents, and the temperature near the intake at ...

I'll try to post some pictures of my o-rings on the old low side flex hose I pulled yesterday. That would be a factory Nissan hose mating to it's factory hard pipe connection on one end, and it was leaking bad enough to drip refrigerant oil a day or so after cleanup. Maybe you'll see something I don...

Thanks for the responses! Cusser , my Frontier is also a 2.4L with about 110K miles on it. I'm in central South Carolina, so it's hot - but not AZ hot. It looks like your fan clutches have failed on both of yours, and I'm curious how you diagnosed them? I've spent more time than I'd like to admit wa...

New guy here chasing his tail and writing a book. So I've had a few years of trouble with the A/C on my 2004 Nissan Frontier. First it was an o-ring on the suction line at the compressor, then a liquid line leak, then the dual pressure switch failed closed, and I blew a charge out of the relief valv...