Cycling Clutch Switch Test

1. Remove wires from cycling clutch switch.
2. Check continuity of cycling clutch switch. Switch contacts are closed at temperatures above 7°C (45°F). If no continuity, replace switch.
3. If contacts are closed, verify switch operation as follows:
a. Connect wires to cycling clutch switch.
b. Set temperature control lever to full cool position.
c. Set A/C blower motor on low speed and push A/C button.
d. Operate engine at 1000 rpm for approximately 5 minutes to stabilize the A/C system.
e. If the compressor clutch cycles on and off 2 to 3 times per minute with temperature between 20° to 32°C (68° to 90°F), the cycling clutch switch is normal. If the compressor clutch fails to engage, check electrical system for open circuit. Above 32°C (90°F) the compressor clutch may be continuously engaged due to the high heat load; this condition is normal.