[9phil9]

The cure is simpler, and considerably cheaper, than you can imagine.
Go the local hardware, or Home Depot type center, and buy some pipe insulation.
It's dirt cheap....like 16 feet for less than $2.50....be sure to get the right size inside, with the self stick edge.
And a small bag of wire ties.

Then insulate the "Cold" line, all the way from the compressor, to the firewall.
You won't believe the difference this cheap fix makes.

But just taking one good look at all that exposed aluminum line, that absorbs heat from the warmest parts of the engine compartment, and you will begin to understand why a lot of that "Cold" refrigerant doesn't make it to the interior.