even with o ring it still leaks... the one close to the engine is slightly smaller too... maybe im not tightening enough.. anyone know what size oring they may be?

 

Sizes are metric. Typically, high side is #6 and low side is #8.

In addition, lube each o-ring with compressor oil or Nylog Blue (for R-134a) or Red (R-12).

 

u know,i buy these manuals to help me with the cars but it seems everytime i need some info i cant find it. so does anyone know where the orifice tube is? i have low high and low low side pressures and only barely coolish air.

 

The FC RX7 AC system does not use an orifice tube. It uses an expansion valve located inside the evaporator case.

It seems you may have insufficient refrigerant in the system.