Workshop Manuals Factory service & repair Land Rover
Land Rover Freelander System Description and Operation (UK)32 · Air conditioning
32 · Heating & A/C

Air conditioning (Operation): Description and operation (page 2 of 2)

Make
Land Rover
Model
Freelander System Description and Operation (UK)
Section
Description and operation
Air conditioningOperation · page 2 of 2

Compressor and Cooling Fan Operating Conditions The Engine Control Module (ECM) controls the compressor and cooling fan operation in response to signals received from the refrigerant pressure sensor, evaporator temperature sensor and engine coolant temperature sensor, either directly or on the CAN Bus from the instrument pack. The refrigerant pressure can be low, medium or high, the system operating characteristics applicable for each condition is shown in the following table:

A/C Compressor On/ OffRefrigerant Pressure Sensor Operating RangeAction
OffMED rangeAir Con MED limit reached, cooling fans switched to High speed.
OffNORMAL rangeNormal Condition, Low fan speed - no additional action
OffHIGH rangeCOMPRESSOR NOT ALLOWED TO BE TURNED ON, cooling fans at high speed
OffLOW rangeCOMPRESSOR NOT ALLOWED TO BE TURNED ON*
OnMED rangeAir Con MED limit reached, cooling fans to High speed
OnNORMAL rangeStandard condition, low fan speed - no additional action
OnHIGH rangeAIR CON COMPRESSOR MUST BE DISENGAGED IMMEDIATELY, cooling fans set to High speed.
OnLOW rangeAIR CON COMPRESSOR MUST BE DISENGAGED IMMEDIATELY*

* With pressure below the low pressure limit, the cooling fans will always be off unless air conditioning is running whilst evaporator temperature drops below minimum. If evaporator temperature drops below minimum, the cooling fans are required to prevent cabin temperature cycling.

The engine management system also drives fan speed based on engine temperature. A faster cooling fan request from either the engine cooling control or the A/C system will override another slow cooling fan speed request.

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