Note: If you remove the radiator cooling fan without disconnecting the upper hose from the radiator (this is how you can do it without draining the coolant), this can damage the radiator plates and tubes.
Removal
1. Partially drain the coolant from the car (see points 1-5 and 7 "Replacing the coolant").
2. Remove the battery (see "Battery - Removal and Installation").
3. Remove the air filter housing (see "Air filter - removal and installation").
4. Disconnect the radiator cooling fan wiring harness connector.
5. Using a 10 mm socket wrench with an extension, unscrew the two nuts securing the radiator cooling fan on the left side.
6. Unscrew the two nuts of the upper radiator cooling fan mount (one of them also holds the radiator).
7. Using a 10 mm open-end wrench, unscrew the nut of the lower mount of the radiator cooling fan.
8. After loosening the clamp, remove the upper pipe from the radiator.
9. Carefully remove the radiator cooling fan from the engine compartment.
Disassembly
1. Using a 10 mm socket wrench, unscrew the three nuts securing the radiator cooling fan to the casing.
2. Using a screwdriver, disconnect the wiring harness from the casing.
3. Remove the fan casing.
4. Using a 13 mm socket wrench, unscrew the fan impeller mounting nut while holding the impeller with your hand.
5. Remove the impeller from the shaft of the radiator cooling fan electric motor.
Original source is on the resource VAZbook
Assembly
We assemble the fan in the reverse order. When installing the impeller, in its groove...
...the fan motor shaft pin must enter.
Installation
We install the radiator cooling fan and all removed parts on the car in the reverse order of removal.