Air Conditioning Control System (page 2 of 5)
- Make
- Land Rover
- Model
- Freelander System Description and Operation (UK)
- Section
- Description and operation
Evaporator Temperature Sensor
1 Refrigerant pressure sensor 2 Air conditioning switch
3 Evaporator temperature sensor
The evaporator temperature sensor is a Negative Temperature Coefficient (NTC) encapsulated thermistor installed in the air outlet side of the evaporator. On K1.8 and non NAS KV6 models, the evaporator temperature sensor signal is fed directly to the ECM. On Td4 and NAS KV6 models, the evaporator temperature sensor is connected to the instrument pack, and the signal is relayed to the ECM from the instrument pack via the CAN Bus.
The temperature signal is used to prevent the air conditioning system from operating when the evaporator is frozen. Frosting of the evaporator cooling fins will cause a reduction in the effectiveness of the cooling system.
If the temperature at the evaporator falls low enough for ice to form on the fins, the ECM withholds or discontinues engagement of the compressor clutch. When the temperature at the evaporator rises sufficiently, the ECM engages the compressor clutch.
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