Air conditioner question

It's not on the truck. I thought you were using shop air? It would be on the air compressor, in the shop.

It's basically a well pump switch

 

If you can't use the proper tools, then take it to a shop, most likely, it is a leaking condenser.

Using shop air will introduce both moisture but also oil, so you need to have the system flushed if you want to keep your compressor.

 

Intoducing air into a refridgeration system will cause the atmosphere inside the system to turn very acidic. Your problems may just be beginning.

 

There is oil that circulates with the freon all the time. If you are leaking freon you are also leaking oil so look for an oily spot. Dye is a great thing for slow leaks. Put some in and add freon + an once or two of oil. Since you added air and already kind of screwed that up I am not sure what to say. Leak detectors are expensive but soapy water in a spray bottle can tell you a lot. Check all the hose crimp ends and everywhere there is a connection to start with. Be careful with that nitrogen. I do not know about his truck but evaporator in an older F700 would explode at 200 PSI or so.

 

If you do not have a good grasp of the fundamentals of a working automotive a/c system, you really don’t need to be fooling around with a cylinder of nitrogen around one. For your and bystanders safety please.

 

If it uses orings as seals, then you could have a leaks there.

The most common place to start, is the condensor, and if you didn't handle it right, you could cause a leak.

I know a lot about A/C and have worked on many of them, but I leave this up to a shop; my time is more important than messing with a problem.

 

I use a freon leak detector from Harbor Freight. Twice I had lost R134a and found the leak. They sell a cheap vacuum pump too.