V8 Quattro V8-3562cc 3.6L DOHC (PT) (1990)
High Pressure Sensor / Switch: Description and Operation
A/C Refrigerant High Pressure Switch (-F23-)
A/C Refrigerant High Pressure Switch (F23)
The A/C Refrigerant High Pressure Switch (F23) turns ON the radiator cooling fan 2nd stage operation when refrigerant pressure reaches specified
value. Activation time varies by ambient temperature and engine RPM.
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Switch has yellow housing or green housing with welded wiring connections.
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Maximum 17.5 bar on high pressure side to activate.
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Closes: 13.1 bar - 17.5 bar (189.9 psi - 253.7 psi).
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Opens: 10.6 bar - 15.0 bar (153.7 psi - 217.5 psi).
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Opening and closing switching points must be at least 2 bar (29 psi) difference.
NOTE:
This switch can be removed without discharging the refrigerant system (Schrader valve under switch).