audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Solar Sensor, HVAC > < Low Pressure Sensor / Switch, HVAC|Description and Operation
Page 1
background image

Low Pressure Sensor / Switch: Service and Repair

A/C Refrigerant Low Pressure Switch -F73-

Function

-

Switches A/C compressor off in the event of pressure drop in refrigerant system (protects compressor when circuit empty).

Switching pressures:

-

Compressor off (switch opens) 1.45 up to 1.6 bar pressure

-

Compressor on (switch closes) 2.9 to 3.4 bar pressure

Removing and installing

-

Unplug connector -A-.

-

Replace O-ring -B- (8.9 x 1.8 mm).

-

Tightening torque: 5 Nm (44 in.lb)

NOTE:

-

To test the A/C system cooling performance, with the switch removed, bridge the two terminals in connector -A-.

-

The refrigerant system remains closed due to the Schrader valve.

Solar Sensor, HVAC > < Low Pressure Sensor / Switch, HVAC|Description and Operation