I know a lot of things, but I know shit all about A/C diagnostics

I've never had issues with the A/C, it's been blowing ice cold all summer.

Today I flipped it to max air and nothing but hot air blasted out. Turning the fan down to 1 / 2 produced coolish, but not very cold air.

The mechanicals seem to be in good working order, clutch engages, fans turn on, the whole 9.

Vehicle is 10 years old and the A/C has never been serviced.

Is there some kind of test I can perform at home to determine coolant levels and the like?

 

You can usually go to pep boys or advance auto and they have gauges to buy. Or Pep boys or another shop an do it for you. Actually, you can buy cans of 134 that have a built-in gauge. I'm assuming it is 134, right?
If the level is low, buy leak detector with a uv pen.
Edit: saw that its only ten years old. Of course it is 134.

 

I mean I figured i could put a gauge on this thing but the high or the low side and what sort of number am I looking for here?

 

I believe its on the low side. Im not sure of the numbers. The gauge usually has the green youre good red youre dead markings.

 

it tells you on the can which line to put it in

 

I'm pretty sure i've tracked down my leak.

I have two rubber hoses, one is in perfect shape
The other is U shaped because they spanned a 4 inch gap with a 12 inch hose and had to put a kink in it.

It's riddled with large cracks along the backside of the hose where it's kinked. Who does this shit.