Functional Test/Check

Chart C-10:

A/C Circuit:

CIRCUIT DESCRIPTION:

When the A/C mode is selected the ECM will supply a ground to the A/C clutch relay. Battery voltage is then supplied to the A/C clutch through the completing of circuit through the thermo switch relay, which is part of the A/C "ON/OFF" switch circuit. If the A/C system exhibits high pressure or an overheating condition exist, the A/C system will be disabled by the open of the A/C high pressure switch or the A/C thermo switch.

DIAGNOSTIC AIDS:

The A/C high pressure switch is located in the high pressure side A/C hose. The thermo cut-out switch is part of the A/C evaporator mounted under the dash.