Mercedes Benz Cooling Fan Problem

Also check the aac pressure at stand still cold.

Mercedes benz cooling fan problem. Most cooling fans use electric motors that have a moderate to high current draw and as a result are commonly controlled using relays. The cooling fan relay is the relay that controls the engine s cooling fans. If it is higher the air conditioning control module presumes that the pressure is high and assigns the fan control module to run at 90 pwm actuation. I have a 2008 mercedes gl 450.

When the correct parameters are met a temperature switch or. Turned on the airconditioner but still doesn t run. The cooling fan doesn t run even at a high temperature. Air then blows thourgh the evaportator which makes it get cold.

The evaporator works in a similar way as the radiator except in this case instead of hot coolant there is cold refrigerant flowing through the evaporator. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. Mercedes w211 radiator fan relay location replacement products used in the video. For example at a coolant temperature of 51 0 c 123 8 f the refrigerant pressure should be no more than 12 bar.