I have converted several systems to 134A and even started using the newer celtec aluminum pump conversion. The new gas should be just as cold. I would change the expansion valve, and while you are up in the top of the cab, clean the evaperator with a coil cleaner. Next, evacuate the system with a good vaccum pump. Pull it down to -25 and let it hammer to get the moisture out of the system. Then turn it off and see that it holds the vaccum, to see the system is leak free. Don't release the vaccum, put oil in if you need it, or hook up your 134a tank and let the vac pull it in. Thats how I was thought to handle a ac system when you break into it. Also, be checking the hi and lo pressures, with the AC on and rpms at pto speed. I have systems that will pump down as low as 15psi on the low side, and be 300 or so on the high side and cool really good. If that same system is at idle, the low side will read 30-40 and high will be much lower. You have to manage the high side pressure to keep from blowing lines, and pto speed checking it will keep you in spec even as the ambient temp increases. Also clean the condenser out front. I promise I am not a clean freak, but I am not going to set in a hot tractor any longer than it takes to get it to our shop and fix it. One other thing, it is better to be comfortable all day than to have goose bumps for a few hours and then the system burst, so don't get wild with the gas.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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