[shorod]

I trust you actually mean refrigerant. Coolant is what goes into the radiator and engine block, often referred to as antifreeze.

The 85psi reading is just with the can connected to the gauge, or the guage connected to the low pressure side of the system? That is high for the low pressure side, but could just be due to a low charge, I suppose. You really should monitor the low and high pressure sides to get a good feeling for if there are other issues with the system besides a low charge.

You also should make sure that the radiator cooling fan and clutch is working properly and that the condensor is not restricted.

Does the compressor clutch cycle at an idle?

-Rod