APU A/C Compressor Replacement?

The cans you buy at the store are 12 oz. Two of them are good enough.

A scale is used when you are charging from a 30 lb tank, though that's kind of outdated. Modern AC machines will remove the old refrigerant, vacuum, collect any oil and reinject the same amount of fresh oil, then install a proper charge all automatically.

 

I am glad you fixed it. it was also learning process.

 

if everything works perfectly then it will blow Ambient temp-50 inside. I am in Phoenix right now. outside is 108F and tripac blows 66-68 F into cab.

 

clean front filter of evaporator, clean condenser, sealed went and properly working expansion valve.

 

If yours has one of the old copper tube evaporators, they aren't really very efficient. I don't know if TK makes an aluminum ribbon evaporator, but those are a lot better cooling.

I was always going to modify a Columbia evaporator to go in mine but then I bought a new truck. My old truck is parked.

 

Once I have added 30oz refrigerant into system. there was no performance improvement. Moreover when I started overcharged tripac in Las Vegas it started blowing black smoke from exhaust. The load was to much for tripac engine.