62B-99
MR-413-X44-62B000$966_eng.mif
V1
CLIMATE CONTROL
Fault finding - Help
Vdiag No.: 44
62B
OPERATION OF THE ENGINE COOLING FAN ASSEMBLY AS A FUNCTION OF THE REFRIGERANT FLUID
PRESSURE AND VEHICLE SPEED
Relative pressure (bar)
GMV = 1 Low-speed engine cooling fan
GMV = 2 High-speed engine cooling fan
GMV = 0 Engine cooling fan stopped
The engine cooling fan assembly is not used for vehicle speeds in excess of 70 km/h, except in rare cases where
the refrigerant fluid pressure is greater than 23 bar despite the high speed (e.g. driving behind a lorry).
When the vehicle is stationary, the engine cooling fan is always used at low speed if the refrigerant fluid relative
pressure is below 19 bar, otherwise it is used at high speed.
While the vehicle is being driven, the engine cooling fan may either not operate, or operate at low or high speed
depending on the refrigerant fluid pressure at the condenser outlet and the vehicle speed.27
23
19
11
1
0AIR CONDITIONING INHIBITION
GMV = 2
GMV = 2 GMV = 1 GMV = 0
GMV = 1 GMV = 0
GMV = 1 GMV = 0
AIR CONDITIONING INHIBITION
20 30 45 70Vehicle speed in mph
