[69hugger]

To clarify, this is not condensation leaking from the inside of the case, but forming on the outside of the case and cooling ducts.
I double checked my drain. It is not leaking inside the car.
The drain fitting on the case had been cracked & repaired before I bought the car, and I bumped & cracked the outlet repair again during my rebuild last winter, but repaired it very securely with epoxy putty. The drain hose is 3/8 ID fuel line, and I can blow easily through it when I disconnect it at the case filling. The line runs slightly downhill to the front of the kick panel, then down through the rocker, exiting behind the front tire.
I also connected another piece of hose to the fitting & blew through it to verify it is not plugged.
The unit is a V/A Gen II Compact system.
As it was still dripping yesterday (36 hours after last use), it is obviously freezing up during extended use.
I think it only makes sense to try to eliminate or minimize the freezeup. I know improper R-134 level can cause that. Does anything else cause freezeup?
It was properly filled to V-A spec. (1.8#) a couple months ago.

They also publish the following specs...
I will get these checked next.

High-side Pressures:
160 to 270 PSI.
NOTE: General rule of thumb is two times the ambient (daytime) temperature, plus 15 to 20%.
Low-side Pressures:
10 to 20 PSI in a steady state.
Center Duct Temperature:
36 ̊F to 46 ̊F.

I will report if these are still in spec...

Thanks to all for weighing in!

Bill