Vent temps may be cooler on low er speeds because the air is contacting the evaporator for a longer period of time thus removing more heat from the air. There becomes a point when this does not happen depending upon the heat load. For testing, we normally use high blower speed 1500 rpm.

almost all of it. Place the drum in a pail of hot water and let the pressure increase.

If you can not find one in the parts store, try the dealer. They can not be that expensive thru the stealership.

You should have a high pressure switch on a conversion. The POA kept the evap from freezing. The A6 did not cycle. I would not use anything other than a flush solvent in a POA and not a powered flush. You have a 50 year old part so be careful.

I have seen the AC make a vehicle overheat. Make sure there is not a plastic bag sucked up between the condenser and radiator. make sure the cooling system fans are working to specs. Make sure you're not using an aftermarket radiator or condenser that is a POS. Also make sure AC is not overcharged. ...

If the case is not too badly broken, fiberglass repair kit has worked for me in the past.

Refrigeration side of system seems ok. You may have what we call a "reheat " problem where the heater core is affecting the vent temps. try clamping or by-passing the heater core. Also, make sure your TXV bulb is mounted on top of the evap tube; definitely not the bottom. You do not want t...

Sounds like the clutch coil or if there is a diode in the coil ckt shorted.

Sometimes a drywall fine thread screw will allow you to get it out as a last resort. Also, you may be able to find an adaptor like a tee that has it's own shrader in it.

Could be bad diode