I filled the system to specs with the AC on max cool. I noticed that the AC wasn't putting out cold air. The clutch on the condenser engages and disengages every couple of seconds. I thought this was a problem with the low pressure switch but the pressure is right. Will 12 make the AC cooler than 134? Will Enviro-safe work better? Can i cut the low pressure switch out of the system and have a manual switch?

 

How much did you put in?

Typical cause for rapid compressor cycling is low refrigerant charge.

If you've just charged it, and it's cycling that fast, you have a big leak somewhere. maybe even big enough to find by listening for the hiss of leaking refrigerant.

Putting in a manual switch would not fix your problem. The purpose of the pressure switch is to disengage the compressor when the pressure is low enough to freeze the evaporator coil.

 

Really need to hook up a gauge set and see what's going on, could be undercharged, pulling down and cutting off on low pressure, maybe the high pressure cutout is doing it if you have a restriction in the system.