A4 Quattro Wagon V6-2.8L (AHA) (1998)
Compressor Speed Sensor: Description and Operation
Refrigerant System (R-134a), Components
A/C Compressor Speed Sensor -G111-, (Zexel Compressors Only)
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Inductive sensor (4 pulses per compressor rotation)
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Determines A/C compressor speed; the A/C compressor clutch control module (Manual A/C) or the A/C control head (Automatic climate control)
compares compressor speed to engine speed and calculates belt slippage (as a percentage) and switches compressor OFF if slippage is too large
(for example, if belt is too loose.)
NOTE:
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A/C compressor speed sensor -G111- is not installed on Nippondenso compressors.
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A thermo-fuse is incorporated into the clutch coil of Nippondenso compressors. Current to the clutch coil is interrupted in the event of compressor
overheating.