Fridge stopped cooling over the weekend. Had this problem once before and had to pay 160 bucks for a top off. Figured it was the same problem (small leak) and decided to buy gauges and 134a myself since the piercing valve was already installed.

It was reading -1 PSI running so I charged it to 5 psi running. Cooled but frost line ran back to compressor and partway down the side. That to me indicated overcharge. so I unplugged, let pressure build in gauge 10-20 psi bled some out, plugged back in and repeated the process checking the frost line. Did this 5-6 times. Got a little impatient and bled out a lot but running I'm at 2-3 psi. Frost is no longer back to compressor but frost line on evap coil is almost to the top (I'd say one row of pipe shy of totally covered). Also saw some frost on line running out of freezer back to compressor, just outside the box). Fridge is cooling (have to check with a thermometer that I didn't have last night), but every time I go by fridge it's running. Concerned that I may have bled out too much.

I put some 134a back in but I don't want to go around in circles if I should be doing something else.

Suggestions?

Does frost line not to top of evap coil mean not enough 134a? Seems like (could just be me), it was blowing colder when I had it overcharged but not sure.

Roveer