Haven't touched ac in most of my trucks in years. Done some interesting things in the past like stealing a working ac from a 300 straight 6 to put it in my non ac truck, etc. I know the basics and have a good vacuum pump but I'm not up on this stuff.
So my 90 7.3 was all original stuff. I "converted" it 7 years ago with fittings and a new orifice tube but didn't have the vacuum pump. I just purged the whole system of whatever was in it and put 40 oz of redtek 12a in it and it was "ok". It had either gotten worse or I get more annoyed by heat in my early/mid 30s so I figured I'll fix it. Got the vacuum pump out, ran it for an hour and a half with all sorts of moisture and stuff coming out the vent even after it was purged. If taylor swift and all these Hollywood ****** stop flying private jets everywhere I'll stop purging my 40oz of gas into the atmosphere, but that's another topic. Anyway I left it overnight expecting it to leak and to my surprise it held perfectly. I opened it to replace the orifice tube for kicks and the one it had wasn't that dirty just a tiny bit of junk at the bottom. Held another vacuum for an hour and charged it.
My first can might not have been full. I regret not just using full cans because I can't be 100% sure how much I have in the system now. I did that can and three full 12oz cans. Realistically there's probably 42 ish oz in the system. The can had "weight" but I don't think it was completely full. If it was that would be 48oz.
Anyways, it works great. It's 93* here and humid in western pa and we took a 40 minute trip ran some errands and 40 minutes back on the highway with some stop and go. Wife and kid were comfy and she noticed it was a lot better. I'd say it's 90% as good as our new car, and some of that difference could be a giant flat metal roof of a crew cab and next to no insulation.
I made a video of the high pressure readings when we got back and I pulled in the driveway. High side was 190 when i first put the gauge on begore i grabbed my phone and settled here. I also have a big electric fan in front of the condenser I left on all day. I didn't hook up low side in the video but it was 35 when I checked after I recorded this.
Seem right to everyone? I thought high side was usually higher than that especially in this heat. I'm hesitating charging it anymore with 42oz in there already. If there's room to make it better I will but I don't want to blow the overcharge port on a compressor, did that once before. Was neat, but only for a 1 time experience lol.
So my 90 7.3 was all original stuff. I "converted" it 7 years ago with fittings and a new orifice tube but didn't have the vacuum pump. I just purged the whole system of whatever was in it and put 40 oz of redtek 12a in it and it was "ok". It had either gotten worse or I get more annoyed by heat in my early/mid 30s so I figured I'll fix it. Got the vacuum pump out, ran it for an hour and a half with all sorts of moisture and stuff coming out the vent even after it was purged. If taylor swift and all these Hollywood ****** stop flying private jets everywhere I'll stop purging my 40oz of gas into the atmosphere, but that's another topic. Anyway I left it overnight expecting it to leak and to my surprise it held perfectly. I opened it to replace the orifice tube for kicks and the one it had wasn't that dirty just a tiny bit of junk at the bottom. Held another vacuum for an hour and charged it.
My first can might not have been full. I regret not just using full cans because I can't be 100% sure how much I have in the system now. I did that can and three full 12oz cans. Realistically there's probably 42 ish oz in the system. The can had "weight" but I don't think it was completely full. If it was that would be 48oz.
Anyways, it works great. It's 93* here and humid in western pa and we took a 40 minute trip ran some errands and 40 minutes back on the highway with some stop and go. Wife and kid were comfy and she noticed it was a lot better. I'd say it's 90% as good as our new car, and some of that difference could be a giant flat metal roof of a crew cab and next to no insulation.
I made a video of the high pressure readings when we got back and I pulled in the driveway. High side was 190 when i first put the gauge on begore i grabbed my phone and settled here. I also have a big electric fan in front of the condenser I left on all day. I didn't hook up low side in the video but it was 35 when I checked after I recorded this.
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Seem right to everyone? I thought high side was usually higher than that especially in this heat. I'm hesitating charging it anymore with 42oz in there already. If there's room to make it better I will but I don't want to blow the overcharge port on a compressor, did that once before. Was neat, but only for a 1 time experience lol.
