So about a year ago my 2010 Fit sat without being started for about 9 months. Since then, the AC has not blown cold air.

The AC compressor clicks on without issue; I believe this indicates that there is not an issue with the refridgerant pressure, the pressure switch, or the compressor relay. It's not intermittent so I don't think it's the AC condenser fan/overheating.

Are any of my assumptions wrong, or if not what's the next steps in figuring out what's wrong?

Thanks in advance!

 

That only means there is sufficient pressure for the system to enable compressor operation, that doesn't necessarily mean the system has enough refrigerant to cool efficiently.

With the system operating, feel the fat pipe or hose (suction line from firewall to compressor) for temperature. Is it cold? Is it warm/hot?

Air mix (temperature) dial or cable problems?

 

The Fit compressor is SUPER picky about AC system pressure. If it is too high or too low, the compressor just won't turn on.

I learned this because after owning the car 3-4 years, the AC got weak and then quit while driving across Nevada. I tried to get one of those DIY recharge cans but I ended up overcharging -- then I let some out and it was probably undercharged. In either case, the compressor was just not working.

I spent the $100 to have a legit shop with proper tools do an "AC service" where they weigh out the perfect amount of R-134 and with the exact amount it has worked fine since (another 3 years).

I'd suggest having a legit shop do the AC service. They can also check for leaks while they have it so you don't waste R-134.

 

Does the compressor fan run when you turn on the AC?

 

Thanks for the responses. Finally got around to trying a recharge today ($30 Walmart kind) and the AC blows cold again. Time will tell if there's a leak or not, if it stops again I'll have to search for one.

The reading on the low pressure line was 0, so I'm not entirely sure why the compressor was spinning, but either way it's working now.