Damon

Guys- I just replaced the compressor and dryer and recharged a system (R134). She's cycling just fine and pressures, at least on the low side (I only have a gague on the filler hose), are right. But it's not getting very cold. Verified that the hot/cold selector system is working right.

I'm starting to wonder if I've got an orifice tube problem. Or could the evaporator be plugged up??

Now, on this particular vehicle I have a built-in comparison method- it's got front and back A/C systems (no, you caught me, not a Camaro- an early 90s Suburban). The front and back both run off the same compressor and how the system functions is otherwise identical to a late 3rd gen Camaro A/C system.

The rear A/C will freeze you out. The front is kinda weak. And the dryer bottle that comes off the front evaporator doesn't get very cold.

I don't even know if the rear system has it's own dryer and orifice tube, but for sure the compressor and the other shared parts aren't causing the problem It's a front system only problem we're having.

Any ideas or diagnostic methods you guys could offer up? Thanks in advance.

AlkyIROC

High and low pressure readings with the AC on max and the engine at a high idle? You'll need to see both pressure to see what the system is doing. Does the high side pressure increase when a piece of cardboard is placed in front of the condenser?