Boost your trucks A/C in 20 minutes.

[Harley03joe]

Originally Posted by hatzie

Envirosafe is still available but not Freeze 12.



R290 is not Freon it's refrigerant grade Propane. If you already converted to R134a you are going to have to make it work.
A 71 should have the big Harrison A6 compressor. That compressor combined with the huge condenser on these pickup trucks should freeze you out of the cab on Max AC even using R134a. Most folks overfill the system with oil. Overfilling with oil insulates the inside of the condenser and evaporator so you don't move as much heat. You'll have to flush the excess oil out of the evaporator and condenser, empty the compressor, then refill the compressor with the correct amount of oil, replace the dryer, vac down, and re-fill.
If your lines have a muffler you'll need to replace that section because you will not be able to flush it out.

The only refrigerant with a spec for the number of pounds to use is the original R12. For non original refrigerants don't use a scale. Follow the link I posted to the Jungle Eddy method for charging the system. This method works with any non original Hydrocarbon and DuPont "Freon" refrigerants.

Hatzie
Thank You For The Info, It Will Come In Handy, I'm Glade There Are People Like You On The Forum
Thank Again
Harley03joe