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Yes, I assumed that the block itself would have larger passages, bigger ball and ball holder etc. I cam just machine the original block to match. Or just make a new block with the correct line sizes. I found 2 for $10 each so got both.

OK, I have an idea. The valve is probably a 2 ton so 24K btu. MEI lists a valve that is 2 1/2 ton, so 30K btu. problem is it has wrong fitting sizes. So I am going to buy the 2 1/2 ton valve and change my block to use the parts from it, then I will have a 2 1/2 ton valve!! Yes there is a...

OK so I need to talk to the maker of the valve to be sure what it is. As you saw, looking the numbers up on the net gives no reliable result and red dot says it takes a 2 ton valve even while they rate the unit at 2 1/2. Thanks. Side note it seems like a few others have been disappointed at the...

Yes that is the great question, what is it rated at? No one knows. Evap is rated at 33K BTU by red dot so a 1 1/2 ton valve would give my results?? Yes turning it in did reduce the suction pressure but also reduced the temp by 10°. Unscrewing the cap will do nothing as the ball valve is already...

# 26 edited to explain how this AXV works and its short comings.

Turning screw in closes valve so suction pressure goes down and cooling went down 10°. Yes I have a sight glass but with 134 I don't expect to get rid of bubbles , it is mostly liquid. High side pressure is already on the high side of the chart. I agree it needs more liquid in the evap. Even...

Well kinda. The cap IS the adjusting screw with spring under it. When the suction pressure is low the top diaphragm pushes down on a rod to the ball valve that opens to allow more freon in evap. When pressure is higher the spring adds to that pressure to close the valve and this controls the...

Installed new genuine AXV, problem is worse. Ambient 90, high side 220, low side 15, evap air 60. At high idle.

It uses a 540031 AXV which is common. The high side is normal at 220 psi on a 90 ° day but the suction is 25 psi which is just below the range it should be in. I will explore adjusting it, the bottom is hard to access but seems to have 2 flat sides, 10mm. I assume back it out so the metering...

Would you agree that a TXV works much better than an AXV? There is a plug on the bottom of the block opposite the control diaphragm. Air out should be at least as low as 40° and maybe as low as 30° in my view. My car is 41° my M35 was 28°, all with 134A

No it is not. Well maybe it is but adjusting it made the low side lower psi.

OK, found 3 things. There is a baffle so all the air does go through the evaporator coil. The A/C only works on recirculate. It does NOT use a TXV, it is an AXV. I think this was a very bad decision since with a high heat load it will actually cool less.

Exactly. Now I am not yet positive of this but will know tomorrow. What do you think about relocating the TXV bulb to trick it into opening more? I would know if it works by the low side pressure.

I started taking the case apart in the truck and the first thing I found was 34° at the header feeding the coil. And it looks like they allowed a huge amount of air to just go around the coil on the ends. I have 30 of these units so tomorrow I am going to take another apart to see how it was...

Yes it seems like it must be restricted. I suppose I could just take the lines off under the cab and do it there since the cab temp is at least 100°!! Maybe I could catch something coming out the inlet.

Inlet to condenser is very hot, outlet is almost at ambient temp so condenser is doing a great job, it is a very large condenser. 968 square inches. Air from evap is same temp regardless of engine rpm. I feel like the expansion valve is restricting the flow to much but everything is new.

Nope, that's not it. Same temp readings as 4 lb charge and 5 lbs. Pressure was too high at 275 and 45 so I went down to 4 lbs and high side is 200 but low side is 25, way to low for 134. Still blows 65° at 82° ambient. New gen 2 unit has been sitting for years.

OK, new A/C install with gen2 evaporator, high side 225, low side 25, what should air from evap be? I barely get 65°. R134A