Examination
The interior blower fan has four rotation speeds, set using the rotary switch for blowing and heating the interior. The rotation speed is provided by the appropriate resistance (resistor). Resistors connected in a circuit «masses» (-) fan motor. This means that the positive charge applied to the motor remains unchanged.
If the interior blower fan is noisy when running at low speed, first check the corresponding resistance. If, despite good resistance, the wipers do not work either, then the problem is caused by a defect at terminal X of the unloader relay.
1. Open the glove box lid. Press the lid stops slightly inward and lift them up. This will allow you to open the lid of the glove box completely and provide access to the passenger compartment electric fan (see illustration).
2. Disconnect the two-pole plug of the fan motor and connect the two auxiliary wires to the connection terminals. One wire from the positive pole of the battery to the contact that connected to the wire in black and blue insulation, and the second from the negative pole to the contact that closed to the wire with brown and red insulation.
If the blower fan motor is working properly, the fan will rotate at full speed. If it doesn't, replace the fan.
If the interior blower does not rotate at all speed levels, then the reason for this may be a defect in one of the resistances.
3. Remove the board with resistances and visually check their condition. If one of the resistances is burned out, then replace the board completely. If the resistances are normal, then a break in the power wire is possible, as well as a defect in the rotary switch on the control panel. In this case, the control unit must be replaced as a set (see illustration).
Withdrawal
The fan motor is removed only as a set together with the impeller.
4. Remove a ware box. The fan motor is inserted into the air duct from the bottom up.
5. Use a screwdriver to pry out the locking bolt on the motor housing.
6. Rotate the motor housing in the duct to the right (clockwise) and remove it from the air duct.
7. Clean the air duct from leaves, etc. caught in it. In case of the remark of additional resistances remove a ware box.
8. Remove the Phillips head screw that secures the resistance plate.
9. Press the retaining bracket down and remove the board.
When installing, make sure the board is sealed in place. If necessary, seal with sealing compound.
AUDI recommends changing the dust filter, fitted as standard since 8/92, every 30,000 km.
10. Remove a noise-proof laying of a back part of a motor compartment.
11. Turn out the rotary lever of a protective cover between a motor compartment and a windshield.
12. Remove the cover.
13. Release the dust filter from the retaining latches and remove it (see illustration).
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