This is my first season with my 09 Sport. Can't get over how little power I get with the AC on. I checked the gauge on my AC Pro, and it reads 35, With the temp at 90 , it should read 45 but the system won't let me put in more juice in to get it to 45 ?

 

What do you mean by 35 and 45? Celcius? AC system pressure?

 

What do you mean it won't let you? AC Pro has a trigger.

 

To put correct amount of refrigerant, you need to evacuate all of it, measure new amount and cycle it in.
If you don't have the machine to do that... take it to have it done at a shop.

 

What's the best method for a full purge?

 

You have to take it to a shop for that.
The AC pro stuff is only good for things that aren't leaking.
Well everything leaks a little, but it should only need a little more every five to ten years.

 

I used SuperTech R134a (no additives), and I was only able to juice mine up to 38psi with an ambient temp of 80F. It wouldn't want to budge past 40 and I didn't want to overfill the system, so I stopped there.

Was blowing cold before, but on the weaker side. Now on lowest temp, fan 4, and recirc, it will hit 42F at the center vent under normal load -- I'm satisfied with those results.