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Replace a Spare part Blower Motor (Heater Blower Motor) – a defective one or if the limit of use has been already reached. Find out useful information about Blower Motor (Heater Blower Motor)

Fans are used in cars to provide comfort driving to passengers and driver. It should be mentioned that there is nothing complicated in fans' construction. They have the same principle of work and construction as ventilators have. Both automotive and consumer systems use an axial fan type. But there is a distinctive point. Car fans are fixed differently because of the special working conditions. They are usually fixed with the help of a pin or vacuum cup. Also there is a special rotating gear in their construction. Moreover, the fan is supplied by in vehicle network, which is used instead of a cigar lighter and designed for voltages of 12 volts.

As for the performance characteristics of these components, the construction of the body and blades is very strong and durable. Moreover, fans are protected from moisture. Also there is a wide range of working temperatures. Faulty fan can became a great problem both in summer and in winter. In summer car operation does not depends on this car part. But in winter without the fan windows will become misted over. If you want to find the reason of failure, you need to disassemble the fan system. One of reasons of fan failure is a faulty electric motor that does not need maintenance and can not be repaired.

It does not matter what is the reason of the fan failure. But it is always easier to buy a new spare part than to repair the worn one. Do not hurry to order a new fan, condenser or air conditioner compressor from service centre. It is better to compare prices in online shops. You will definitely find an appropriate car part at a good price in the catalogue of our online shop.

Blower Motor (Heater Blower Motor) for BMW 3 (E46), AUDI 80 Avant (8C, B4), VW TRANSPORTER V Box (7HA, 7HH, 7EA, 7EH)

Fan failure
  • appearance of cracks and chips;
  • contact oxidation;
  • blown fuse block;
  • discharge of contacts in the assembly block;
  • wear of ignition relay;
  • broken resistor.
Symptoms of fan failure
  • heater switches irregularly (only when engine is warm);
  • malfunction of the heater switch;
  • the heater works only in an extreme position;
  • heater does not turn on.
Causes of fan faults
  • a short circuit in the wiring;
  • wear of components;
  • overvoltage in the circuit;
  • moisture getting on the item.
Diagnosis of fan

In the first place it is recommended to check whether the wiring is burned. The consequence of this problem is usually getting blown fuse filler in the fuse. If you have a suspicion that faulty contacts are in the mounting block (one of the most frequent breakdowns), then you should move the harness wires going to the unit. If the motor starts working, then perform an inspection of the contact block. If you suspect a failure of the switch (as shown by the failure of the fan speed controller), you need to prepare a 12 V light bulb and solder two wires to it. You can then proceed to disassembling of the center console to get to the switch on the back side. Now you need to turn on the ignition, not starting the car and connect the light bulb "minus" with a cleaned spot of the car body. The second wire alternately connect to terminals 1, 2 and 3, putting the switch to the correct position at the same time. If the lamp lights, the switch is working, if not, then connect the light bulb to the "plus" arm. If the lamp still does not light up, it means that the fault cause is in the wiring, or blown fuse link.

Repair of fan

Quite often, the problem with the faulty fan can be solved by replacing the fuse or clearing the short circuit. Such work is recommended to carry out on a special stand at the station. The faults also often occur due to ignition relay breakage which is simply replaced. It is also possible that the disruptions are caused by the malfunction of the fan motor. In case of power supply to motor and unstable work there are several options of causes and solutions. Thus, disruptions in the auto part operation can be caused by poor contact on the fan, sticking of motor brushes and motor burnout. In the first two cases, experts easily solve the problem, in the third, you will have to replace the motor.

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