Refrigerant System Performance

Pressure & Temperature Charts:

1. Connect manifold gauge set to system.
2. Start engine and turn A/C system ON.
3. As soon as system is stabilized, record high and low pressures as indicated by manifold gauges.
4. Low side pressure should be 20-41 psi, and high side pressure should be 185-263 psi.
5. As low side pressure drops, high side pressure should rise. As low side pressure rises, high side pressure should drop.
6. Record center duct temperature.
7. Determine and record ambient temperature.
8. Compare test readings with chart.