A side note------R134A

leaky system, just use friggin propane (its R290 or 'CARE 40') out of the Coleman camp bottles. I can tell you it works. I put in the max the R134 guage says is safe for ambiant air temp and the darn thing runs as cool as a cucumber. So what if it all leaks out in 4 months, the bottle was 5 bucks, and you only used half! "The use of R290 is increasing due to its low environmental impact and excellent thermodynamic performance. It is non-toxic with zero ODP (Ozone Depletion Potential) and very low GWP (Global Warming Potential)"...I grafted an old propane torch head into an A/C manifold supply line and screwed a bottle on . Sure its flammable, (...Such substitution is widely prohibited or discouraged in motor vehicle air conditioning systems, on the grounds that using flammable hydrocarbons in systems originally designed to carry non-flammable refrigerant presents a significant risk of fire or explosion.
Vendors and advocates of hydrocarbon refrigerants argue against such bans on the grounds that there have been very few such incidents relative to the number of vehicle air conditioning systems filled with hydrocarbons...) but so is gasoline under 55 psi. If I want to run R134 again, Ill find that damn leak before I go spending $12 on a LITTLE CAN with a $10 deposit ($22!!!) F that.