Air bags not inflating when cold

Where are you putting the alcohol into the system? If you're dumping it in ahead of the dryer it'll damage the dryer cartridge.

 

Manually move the lever on the height valve to the fill direction by about 30 degrees and see if they fill.

If you don't have pressure at the height valve try tapping the pressure protection valve will sometimes help and it should be opening at 80psi.

Remember that metal shrinks when it gets cold. A pressure protection valve can be gummed up and not open when it is cold even without water being present.

 

Drain the tanks after determining which is the wet tank. take a plug or line off the wet tank and pour in 4 to10oz methyl hydrate (find it at a paint store if nowhere else) then start and charge the system. the fumes will go throughout the system and will start to dry out any moisture and remove ice crystals.