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These are my guage readings at 70 degree farenheit.According to an AC conversion for guages calibrated in Pascals, 35-40F converts to 241-276 KPa, 140-160F converts to 1000-1103Kpa. The guages are in Mpa which by coversion is 3 decimal points to the left so .241-.276 and 1-1.103 Mpa. Here are my guage readings at 68 degrees ambient temp. Rear air is same as ambient temp on max ac and the front is pictured. There seems to be virtually no pressure differences which I would interprret as a novice that there is ) freon flow. There is freon in the system with the high pressure being approx correct but the low side is too high if I understand correctly. Basically when at highway speeds at 75 degrees yesterday the front AC was cold and the rear was outside vent temp only. There are slight leaks in the low and high pressure valves. I have a Mastercool replacement tool but they did not send a fitting for the high pressure valve. Any ideas what these readings mean as far as what may be wrong?
The same pressure reading on both gauges indicates 1) the compressor isn't running or 2) the manifold valves are not closed causing, in effect, the equivalent of a "short circuit".
OK today from a cold start pressure valves couplers and manifold valves open on both sides. Ambient temp around 70 degrees. The compressor is running continuously (which includes the clutch)--as in NEVER cycles off now.
The black marks are my approx conversion of psi to MPa
The same pressure reading on both gauges indicates 1) the compressor isn't running or 2) the manifold valves are not closed causing, in effect, the equivalent of a "short circuit".
I believe you sir are correct. This aheap a$$ thing from Amazon which included a vacuum pump is a piece of crap. The attachments to the high side and low side pressure vales have a rotating on and off valve. The on and off valves on the side of the manifold do not function correctly. The high pressure side will cut off but the blue side plastic crap **** just spins either direction. By using the loading valves on off I got the low side correct and the highside below normal but cooling. That was after 3 cans of freon. I consider this to be God saying "Quit you idiot!" I looked up the guages. They're from freaking "Alibaba" worse that China! While I still have the intellectual curiosity, as a novice starting with the deck stacked against me really sucks. There was not a single shred of instructions--=not one piece of paper! Guess that teaches me not to buy any cheap a$$ tool off of Amazon!
Well I couldn't stand it. I ordered a recovery tank and new guages which came--nice... No Alibaba!
Waiting on orifice tube, tool, and rear expansion valve. The Mastercraft tool came with it's standard valve size tool. Unfortunately, the X seems too have nothing standard..so I decided to just recover the freon, vacuum, replace orifice tube and Expansion valve. I tightened my existing valves and they do not leak now verified by detector. I have ice cold air it the front, but not in the back. From what I read-that's likely the expansion valve--I think...I hope
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