Obd2 scanner it enables two substantially refrigerant flow

How to Diagnose Auto A/C Expansion Valve Probe 1Attach the gauges to the A/C technique by locating the low-pressure and high-pressure service ports. The low-pressure port is often discovered on the low side line amongst the accumulator (often on the accumulator) as well as the compressor.

The accumulator will be the cylindrical aspect attached to the method near the passenger side of your firewall.The high-pressure port is situated on the high side line between the condenser and evaporator. The condenser is the radiator-like aspect positioned within the front with the car, and also the evaporator is located beneath the dash.Be sure the valves are closed on the gauge assembly, and attach the quick-disconnect hoses towards the service ports.2Start the engine and set the A/C controls to max A/C, medium blower speed and recirculating air. Enable the method to run for 5 minutes for pressures to stabilize.3Normal gauge readings might be 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 particular of two means. When stuck open, it enables two substantially refrigerant flow, along with a drop in high side pressure. A gauge reading of much less than 200 psi on the high side will probably be noticed when this happens. When stuck closed auto diagnostic software, a larger than normal high side reading will probably be observed. Usually Obd2 scanner, this may be more than 400 psi and climb till the high-pressure switch shuts down the technique. Very low or quite high readings on the high-side gauge indicate a faulty expansion valve.