System Switches - Function/ Removing/ Installing

A/C REFRIGERANT SYSTEM (R-134A) SWITCHES, FUNCTION/REMOVING/INSTALLING

A/C refrigerant high pressure switch

Function

Switches A/C clutch OFF if system pressure is too high.

^ switch identification: red housing with bonded wire connections

^ switch located on left side of condenser

^ switch opens (compressor OFF): 28.2-31.0 bar (409-450 psi)

^ switch closes (compressor ON): 10.3-17.2 bar (149-250 psi)

Removing/installing

- remove electrical connector and unscrew high pressure switch

^ refrigerant system remains closed (Schrader valve under switch)




- install new O-ring seal -A- (7.6 mm x 1.8 mm), lubricate with refrigerant (PAG) oil and ensure proper seating in groove

- torque switch to 5 Nm (44 in. lb)

A/C REFRIGERANT HIGH PRESSURE SWITCH

Function

Switches coolant fan to 2nd speed operation.

^ switch identification: green housing with bonded wire connections

^ switch located on left side of condenser

^ switch closes (2nd speed ON): 14.2-17.4 bar (206-252 psi)

^ switch opens (2nd speed OFF): 11.7-15.0 bar (170-216 psi)

^ opening and closing switching points must be at least 2 bar (29 psi) difference

Removing/installing

- remove electrical connector and unscrew high pressure

^ refrigerant system remains closed (Schrader valve under switch)




- install new O-ring seal -A- (7.6 mm x 1.8 mm), lubricate with refrigerant (PAG) oil and ensure proper seating in groove

- torque switch to 5 Nm (44 in.lb)

A/C REFRIGERANT LOW PRESSURE SWITCH

Function

Switches A/C clutch OFF if system suction pressure is too low (low refrigerant charge). This switch protects the compressor if the refrigerant system is empty.

^ switch located in right plenum

^ switch opens (compressor OFF): 1.45-1.6 bar (21-23 psi)

^ switch closes (compressor ON): 2.9-3.4 bar (42-49 psi)

Removing/installing

- remove plenum tray

- remove electrical connector and unscrew low pressure switch

^ refrigerant system remains closed (Schrader valve under switch)




- install new O-ring seal -A- (8.9 mm x 1.8 mm), lubricate with refrigerant (PAG) oil and ensure proper seating in groove

- torque switch to 5 Nm (44 in. lb)

- install plenum tray