Vehicles with diesel engines are equipped with two two-speed electric radiator fans, activated by a relay located on the relay block under No. 2, and rotating simultaneously at the same speed (see illustration 10.0c).
Some models with petrol engines are also equipped with two-speed fans. The thermal switch activates the second stage of fan rotation at a significant load on the engine and an increased temperature of the coolant. There is another option to turn on the fan to the second stage of revolutions. This function is performed by a two-stage thermal switch, the circuit of which includes a relay located on the relay block under No. 11.
On vehicles with diesel engines, relay number 11 closes the fan operation contact in the first speed stage. The power supply of the fan motors at this stage is carried out through additional resistances (see arrow in illustration 10.0g). The second stage is activated through a relay located on the block number 18.
Attention! The thermal switch is powered via terminal X. This means that when the ignition is switched off, the radiator fan (s) cannot turn on spontaneously. For vehicles equipped with a four-cylinder gasoline engine with a power of 85 kW, as well as a five-cylinder one, the thermal switch of the radiator blower electric fans is powered according to the following scheme. This means that in the event of a thermal blockage in the engine compartment, the fan turns on even after the engine is turned off (see arrows in illustrations 10.0e). Be careful!
Some AUDI 80 models have a special package. For example, cars with a four-cylinder gasoline engine with a factory-installed tow hitch or cars with enhanced cooling have an additional fan installed next to the one already mentioned. This additional fan is driven by the main fan via a V-belt (see illustration 10.0g).
Vehicles with a five-cylinder engine do not have room for a second radiator fan. Therefore, on vehicles with this engine, when equipped with a towing device by the manufacturer, a more powerful radiator fan is installed.
Cars with six-cylinder engines have one fan in the standard configuration, and two autonomous fans in the special configuration.
Both radiator fans are connected in parallel and can operate simultaneously at both the first and second speeds.
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