I'm trying to add some 134 to the AC to see if it will work at all. it slowly stopped last year. I got a charge hose and a can of just 134a. When I attached the hose the gauge pegs on the high pressure side. I know I'm on the low pressure side and the compressor isn't running. It starts and stops. Should the pressure be that high with the compressor not running?
What is the reading on the low pressure side when the compressor is running? If it reads high and assuming that you actually have the gauge on the low pressure side, then either the gauge is faulty or you have too much refrigerant in the system. The spec, assuming you have the system set to MAX COLD, fan at high speed, doors open, is Low pressure side: 0.15 to 0.25 MPa (1.5 to 2.5 kgf/cm2) High pressure side: 1.37 to 1.57 MPa (14 to 16 kgf/cm2)
Deffinately on the low side next to h/v cable in middle of engine bay big L on the cap. Tried gauge on another car and it worked fine. I haven't added anything to system yet.
