A/C System - Manual

OPERATION
The A/C-Heater System is powered by a 10A Fuse 9 and 15A Fuse 5 of the Interior Fuse Panel, which are both hot with the Ignition Switch in the "RUN" position, and by 50A Maxi-Fuse 5 of the Power Distribution Box, which is hot at all times.

Blower
With the Ignition Switch in the "RUN" position, current flows to energize the coil at the Blower Motor Relay. The Blower Motor Relay's contacts will close and allow current to flow from the 50A fuse 5 of the Power Distribution Box to the Blower Motor. The speed of the Blower Motor is controlled by the Blower Motor Control Switch and the Blower Motor Resistor.

When the Blower Motor Control Switch is in the "HI" position, the Blower Motor is grounded for full speed operation. In any other "ON" position (1, 2 or 3) current flows through the Blower Motor Resistor; which controls the amount of current that flows through the Blower Motor with one, two, or three resistors.

A/C-Heater
The A/C System can be turned on by activating the A/C Switch located at the Blower Motor Control Switch. Current will then flow from the 1OA Fuse 9 through the closed A/C Switch to the Clutch Cycling Pressure Switch.

The Clutch Pressure Cycling Switch cuts off power to the A/C Clutch Field Coil when the system has low suction pressure. Current will then flow from the Clutch Cycling Pressure Switch to the Wide Open Throttle (WOT) Relay.

The WOT Relay is controlled by the PCM and is energized until wide open throttle occurs. With the A/C Switch closed, the Clutch Cycling Pressure Switch closed and the WOT Relay energized, current will flow to the A/C Compressor Clutch Solenoid, which allows the engine to drive the compressor.