SLK 230 (170.449) L4-2.3L SC (111.983) (2001)
Refrigerant Pressure Sensor / Switch: Description and Operation
The refrigerant pressure sensor (B12) measures the refrigerant pressure and relays it to the pushbutton control module.
Switching off the A/C compressor
The refrigerant pressure sensor (B12) transfers the current value to the pushbutton control module. When the following values are present the A/C
compressor is switched off by the pushbutton control module:
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Refrigerant pressure < 2 bar = A/C compressor off
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Refrigerant pressure > 28 bar = A/C compressor off
Switching on the auxiliary fan
The pressure measured by the refrigerant pressure sensor (B12) is also compared with a value stored in the pushbutton control module.
When the following values are present the fan is adjusted infinitely:
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Refrigerant pressure > 16 bar = fan low speed
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Refrigerant pressure > 20 bar = fan maximum speed