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A/C Pressure Switch
A/C Refrigerant System Component Description
A/C Pressure Switch
• Depending on engine type, refrigerant systems have either an A/C Pressure Switch (F129) or High Pressure Sensor (G65) installed. Refer to appropriate wiring diagram.
A/C Pressure Switch (F129) has three functions:
• Switches the A/C Clutch (N25) off when excessive refrigerant circuit pressure is present (e.g.: insufficient air flow over condenser or when overcharged).
• Switches the A/C Clutch (N25) off when insufficient refrigerant circuit pressure is present (e.g.: when refrigerant has leaked out)
• Switches on the second speed Coolant Fan (V7) when refrigerant circuit pressure increases.