Tell him to take a look at the MACS (Mobile A/C Society)site. About ten years ago I started having customers asking me to look at the A/C systems on their equipment. I initially did some looking and had one call a local guy I had heard about. That went South when I was doing some other work on a machine when he came out to do his thing. If everything on the machine wasn't factory he didn't have a clue. From that point on I got online, found the MACS site, took their online course, and got my card that way.
That said basics of the two types of mobile systems are going to be the same, regardless of the mfg (ie orifice tube system or expansion valve system), with the majority of equipment systems being of the expansion valve type. Beyond the basics, the electronics are going to be different between brand, and even between types of equipment within a brand (ie CAT excavators often have sunligh sensors to make the system run differently when the sun hits them/the cab vs when they/the cab is in the shade), while most other types of equipment don't have them.
In the end it's not all that hard to learn the basics and then build on that knowledge from there through the old school of OJT.
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