1996 Air Condition System Issues

[Five]

1996 ram 2500 diesel. AC had leaking compressor.
Bought everything new except for the evaporator. Replaced compressor, condenser, all lines, and accumulator. Pulled a vacuum with no leaks. Added correct amount of PAG 100 oil after removing oil from compressor(4 oz in compressor and 3.75 oz in the condenser). Weighed and added just about 32 oz of 134a to the system(Closer to 30 oz).
Darn ac is only cooling to 60 degrees in the cab; not cold.
Static pressure on both low and high at 90 psi
Running, at 75 degrees ambient and high humidity here in Georgia, low pressure was steady and normal at 40 PSI, but high pressure rose slowly but steadily to 425 psi. Compressor not shutting off.
I shut the system off.
Any ideas? Is the evaporator a tube- or close cell-design system? Someone tells me that the high pressure cutoff is computer managed; I thought that the high pressure switch in the high pressure line controlled the compressor shutting off? I darn well do not want to pull the evaporator if that isn't the problem.
Thanks in advance for any advice.
Tom

 

[2012RAM1500RT]

1996 ram 2500 diesel. AC had leaking compressor.
Bought everything new except for the evaporator. Replaced compressor, condenser, all lines, and accumulator. Pulled a vacuum with no leaks. Added correct amount of PAG 100 oil after removing oil from compressor(4 oz in compressor and 3.75 oz in the condenser). Weighed and added just about 32 oz of 134a to the system(Closer to 30 oz).
Darn ac is only cooling to 60 degrees in the cab; not cold.
Static pressure on both low and high at 90 psi
Running, at 75 degrees ambient and high humidity here in Georgia, low pressure was steady and normal at 40 PSI, but high pressure rose slowly but steadily to 425 psi. Compressor not shutting off.
I shut the system off.
Any ideas? Is the evaporator a tube- or close cell-design system? Someone tells me that the high pressure cutoff is computer managed; I thought that the high pressure switch in the high pressure line controlled the compressor shutting off? I darn well do not want to pull the evaporator if that isn't the problem.
Thanks in advance for any advice.
Tom

May be a stupid question but you didn't mention orfice tube. I know you said you changed all lines and if so did it come with an orfice tube or not. The only thing I can come up with so far.

 

[Five]

new orifice tube is in the new condenser.
Thanks, Tom

 

[2012RAM1500RT]

Sitting still if you have access to a fan (the bigger the better) to put in front of the radiator try blowing as much air through the condenser as the fan will, that high of pressure on the high side is another sigh of not enough air cooling condenser. Fan clutch? Just another suggestion if you haven't already done.

 

[Spike95]

new orifice tube is in the new condenser.
Thanks, Tom

Do you mean that one came with the condenser? Orifice tube should not be “in” the condenser. Also 425psi is crazy high, and even 40psi is a bit high for the low side of system while compressor is running. I know you said you bought everything. Did that include a high pressure cut off switch?

 

[crash68]

Given the head pressure, the low side should have gone ballistic also. I'm going take a guess moisture in the system, most likely from the oil absorbing it.
Dump the charge, replace the desiccant and then pull a vacuum for an hour or two. Break the vacuum with 134a with just enough to make the system have a positive pressure then pull another deep vacuum (a micron gauge would help determine if there's moisture or leaks).