90 Quattro 20V (Canada) L5-2309cc 2.3L DOHC (7A) (1989)
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A/C Low Pressure Switch: Description and Operation
A/C Refrigerant Low Pressure Switch
The A/C Refrigerant Low Pressure Switch (-F73-) controls evaporator temperature by cycling the compressor clutch on and off. The A/C Low Pressure
Switch is also used to protect the compressor when refrigerant pressure drops too low. This switches the A/C compressor clutch OFF when A/C
refrigerant is too low. The switch opens approximately 14.5 PSI (1 bar). A/C refrigerant system does not need to be discharged to remove or install this
component.
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Switch opens: 0.8 bar - 1.1 bar (11.6 psi - 15.9 psi) .
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Switch closes: 2.3 bar - 2.9 bar (33.3 psi - 42.0 psi).
