Attach the gauges towards the A/C program by locating the low-pressure and high-pressure service ports. The low-pressure port could be discovered on the low side line in between the accumulator (at times on the accumulator) and the compressor. The accumulator is the cylindrical aspect attached towards the program near the passenger side from the firewall.
The high-pressure port is positioned on the high side line amongst the condenser and evaporator. The condenser would be the radiator-like aspect situated within the front on the car, plus the evaporator is situated beneath the dash.
Be sure the valves are closed on the gauge assembly, and attach the quick-disconnect hoses for the service ports.
Start the engine and set the A/C controls to max A/C, medium blower speed and recirculating air. Permit the method to run for 5 minutes for pressures to stabilize.
Normal gauge readings will be in between 30 and 45 psi on the low side, and 200 to 350 psi on the high side. The expansion valve can fail in one of two ways. When stuck open, it allows two much refrigerant flow, and a drop in high side pressure . A gauge reading of less than 200 psi on the high side will be seen when this happens. When stuck closed, a higher than normal high side reading will be seen. Typically, this will be over 400 psi and climb until the high-pressure switch shuts down the program. Very low or very high readings on the high-side gauge indicate a faulty expansion valve.
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