V8 Quattro V8-3562cc 3.6L DOHC (PT) (1990)
Low Pressure Sensor / Switch: Description and Operation
The A/C Low Pressure Cut-Out Switch F73 is 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 (Schrader valve under switch).
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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)