Radiator Fan, Low Speed and High Speed

The car may be equipped with either a 1 step or a 2 step radiator fan.

The speed of the 1 step fan is somewhere between step 1 and step 2 of the 2 step fan.

The low speed relay is connected to pin 5 and controls the 1 step fan and step 1 of the 2 step fan.

The high speed relay is connected to pin 6 and is used to control the second step in the 2 step radiator fan which can be recognized from the extra resistor mounted near the fan motor.

The control module starts and stops the radiator fan by grounding the relays at pre-programmed coolant temperatures.

If the car is installed with A/C and the pressure in the A/C is 16.5 bar, the pressure switch closes on the desiccant container and grounds the low speed relay, which starts the radiator fan.

In certain hot markets, there is an extra pressure switch on the lower connection of the condenser which closes at 22 bar and grounds the high speed relay, which results in the fan running at top speed. In order to activate the second step, the engine must be running.

After-running of the fan is in step 1 and the control module reads the temperature for 5 minutes after the ignition is switched off. During these 5 minutes, the fan can be on for a maximum of 3.5 minutes.


WARNING
Several minutes can elapse before the fan is switched on. For this reason, avoid touching the fan for at least 5 minutes after the engine has been switched off.