Additional electric fan
Examination
1. The power supply to the fans is supplied through the ignition switch, a fuse and a pair of series-connected (service) resistor. The circuit is completed by a fan on sensor screwed into the left side of the radiator.
2. If it turns out that the fan refuses to work, warm up the engine to operating temperature and leave it to idle. After a few minutes the fan should turn on (until the pointer reaches the red sector temperature indicator or until the warning indicator lights up).
3. If this does not happen, turn off the ignition and disconnect the test connector from the fan on sensor. Bridge the two pins on the connector (cm. Electrical circuits - most models have two-stage sensors) piece of wire and turn on the ignition. If the fan does not work, the sensor probably burned out - in this case it is replaced.
4. If the fan still does not rotate, check for supply voltage at the switch. If there is no voltage, check the entire circuit (the fault may be in the motor, and the fuse may blow). If there is voltage, check the connection "mass" sensor output with "weight". The connection may need to be re-established.
5. If both food and "weight" It appears that the fan motor is most likely defective. To check it, you can connect the 12V power supply directly.
Withdrawal
6. Remove the heatsink as described in paragraph 3.
7. Loosen and unscrew the mounting bolts, remove the fan frame from the back of the radiator (pic. 5.7, a, b).
8. Unfasten the motor wiring at the rear of the frame, unscrew the fastening nuts and pull the motor out of the frame. On some models, the impeller will have to be removed from the motor to provide enough space. Bend the lock washer and unscrew the fastening nut (on some models left hand threaded nut), to remove the impeller (pic. 5.8, a-c). If the motor is faulty, spare parts are not supplied for it, the motor is replaced entirely.
Installation
9. Install the fan on the frame and securely tighten the nuts of its fastening. Lay the wiring correctly and attach it. If necessary, seat the impeller on the motor shaft, install the lock washer and tighten the nut. Tighten the nut and bend the tab of the lock washer.
10. Install the fan with the frame on the heatsink and securely tighten the mounting bolts.
11. Install the heatsink as described in paragraph 3.
Viscous fan driven
Examination
12. For a motorist, the welding of a viscous coupling can present certain difficulties. The only check that is easy to make is that there are no leaks in the clutch and the integrity of the blades. On a cold clutch, the fan rotates freely, the clutch only works at a temperature of 75°C. If there is any doubt about the performance of the coupling, it is replaced.
Withdrawal
Note: The Audi reed wrench, part number 3212, or a suitable replacement, is very useful for removing the clutch.
13. Pull the front panel to the position "maintenance", as described in chapter 11.
14. Remove the auxiliary drive belt as described in chapter 2A or 2B.
15. Unscrew the fastening bolts and remove the impeller from the coupling, remembering the method of their installation (pic. 5.15).
16. Lock the pulley with a 5x60mm bolt by inserting it into any of the pulley parity holes. Pass an 8mm Allen key through the drive pulley mounting bracket, insert it from the back into the head of the axle bolt. Loosen, unscrew the bolt, remove the viscous coupling from the engine (pic. 5.16).
Pic. 5.16. Removing the viscous drive pulley: 1. Bolt 5X60mm; 2. Hexagon 8mm; 3. Pulley
17. If necessary, the viscous coupling can be removed from the pulley by unscrewing the mounting bolts.
Installation
18. Install the viscous coupling on the pulley (if filmed) and tighten the fixing bolts to the specified torque.
19. Install the clutch pulley in place, insert the axle bolt and tighten it, tightening it to the prescribed torque. To do this, insert the hexagon from the back of the coupling into the head of the axle bolt, locking the pulley with a 5x80 mm bolt inserted into one of the peripheral holes, as in removal.
20. Install the impeller.
21. Install the auxiliary drive belt as described in chapter 2A or 2B.
22. Install the front panel as described in chapter 11.
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