Re: 72 ranchero not cooling properly 134a system
Posted: Tue May 17, 2016 10:31 am
Ok, you have all new components.
Obviously the one non OEM part is where the problem is.
The OEM TXV has a pressure reference line that was originally plumbed in to the POA valve. Now it is just plumbed in to an open pipe. The reference signal is no longer right.
I am presuming that the TXV bulb is clamped well to the evaporator line, and the whole assembly is properly insulated from engine heat?
Your blend door is working & sealing well?
POA valves were never considered "rebuildable" . There were never any internal parts for sale. So a "rebuilt" unit is repaired with what? Uh huh.
AMA has been around a long time. They sell a lot of parts, but do not specialize in NOS stuff like other companies. These forums have been around a long time too - recently the very old software became unsupported, and the old posts were archived. Many posters here have been doing this stuff since before that Ranchero was new.
Buy a NOS valve. Get it installed, and while you have the system empty, check the oil level in the crankcase of the York. Pump the system down & charge it.
Post some test pressures when you get it back together.
.
Obviously the one non OEM part is where the problem is.
The OEM TXV has a pressure reference line that was originally plumbed in to the POA valve. Now it is just plumbed in to an open pipe. The reference signal is no longer right.
I am presuming that the TXV bulb is clamped well to the evaporator line, and the whole assembly is properly insulated from engine heat?
Your blend door is working & sealing well?
POA valves were never considered "rebuildable" . There were never any internal parts for sale. So a "rebuilt" unit is repaired with what? Uh huh.
AMA has been around a long time. They sell a lot of parts, but do not specialize in NOS stuff like other companies. These forums have been around a long time too - recently the very old software became unsupported, and the old posts were archived. Many posters here have been doing this stuff since before that Ranchero was new.
Buy a NOS valve. Get it installed, and while you have the system empty, check the oil level in the crankcase of the York. Pump the system down & charge it.
Post some test pressures when you get it back together.
.