Short version: #$%&*!!! Defective Brand New Schrader Valve Core
Medium version: The defective valve core is on the high side with the idiot protection mandated 3/16” male flare size service port. I have seen a fancy “Superheat Calculation and Valve Core Replacement Tool” (valve core replacement under pressure), but I assume that it is for HVAC systems and has 1/4” female fitting size. I have a special adapter fitting that fits on the MAC idiot protection mandated 3/16” male flare size high side service port and converts it up to1/4” male flare to fit my standard set of 1/4” hoses. I cannot use this adapter to adapt it to the Tool. My adapter is too long and it does not have a clear path: it has a valve core depressor pin. Does anyone know if this Tool, or some particular brand of this Tool, will reach all the way through some 3/16” to 1/4” adapter to allow me to change the brand new defective valve core? Does anyone know of a particular brand of super short adapter 3/16” female flare to 1/4” male flare?
Verbose version: ***** 45 with one blow ***** I successfully repaired my first MAC. er , a , short of: after running for a while, the system blows 45 F most of time, and on the highway at 60 mph it blows 42 F. I washed off the evaporator in my kitchen sink (removed ¼” mat of dog hair), replaced the TEV, replaced the RD, installed new O-rings in the compressor, installed compressor main seal, flushed with shop air, flushed with mineral spirits, flushed with lacquer thinner, flushed with R-141, put in 4 brand new Schrader valve coress; used a 30 cc syringe to put in the specified amount of oil, re-installed and filled with 50 p.s.i. dry nitrogen and waited overnight. It held pressure just fine, (okay it went down to 47 p.s.i. but I just attributed that to the night time drop in ambient temperature). I vacuumed it out for over an hour. My brand new vacuum pump (hooked directly to my brand new Thermistor Vacuum Gauge) pulled a 20 micron vacuum. When vacuuming via my brand new Manifold Gauge I could only get the vacuum down to 2000 microns although it stayed there for over ½ hour. When vacuuming directly only to the high side using only one hose I got the vacuum down to 200 microns and it stayed there for over ½ hour. (yep, I have a lot of valves and tee’s and hoses). So,… I charged up the system, very slowly (R-12) ; first 12 oz. can with the engine off, then with the engine on (had to hot wire the compressor clutch for a while) then two more 11 oz cans of year 1986 Badger Propel Air Brush Propellant (pure dichlorodifluoromethane). Then Yippee, cold air blowing out of the dash vents and pretty close to book “normal” gauge readings. Then, … I took off the high side hose adapter and #@$$%!!! the brand new valve core was spitting refrigerant and oil. (I know now I should have pressure tested the system with the Manifold Gauge off ; the leaking valve core was hidden by the sealed hoses.) So I put the adapter back on and started cussing. I asked a knowledgeable and experienced HVAC friend of mine and he said he has found many such defective valve cores and on some occasions, when the situation dictated, he just put on a plumbing fitting brass cap with an O-ring and the cap has sealed for years and years with higher R-22 pressures. So, of course this happened to me on Labor Day and no well stocked plumbing stores were open, and all the Auto Parts stores had only plastic caps. I had to wait till Tuesday and I bought 10 brass caps. I got all my tools set up, I installed a nice fitting O-ring, I sprayed the parts with Brake Cleaner, I dried all the parts with dry Nitrogen, I put Nylog on the female cap threads. I was going to also put Nylog on the male threads, but when I took off the adapter fitting; the spraying refrigerant oil mist thwarted that idea. Anyway, the cap sealed the leak so far (no soap bubbles) . I am going to leave it this way, but if the system fails, I want to be able to put on gauges; someday I want to replace that @@#$%!!! Defective brand new valve core. I don’t have a recovery system and recovery tank and I don’t want to give away my R-12 to the AC shop that took my first R-12 for free, but wanted $4/oz to put it back in.