2. Remove the grille.
3. Disconnect the wiring at the electrical connector.
4. Unscrew the fixing bolts and pull out the fan cover (fans) (see photo).
5. If necessary, unscrew the nuts and remove the fan motor from the casing (fan motors). You can unscrew the bolts and remove the impeller (impellers) from motor shaft (motor rollers) (see photo).
6. Installation of fans is carried out in reverse order. If the fans start to work poorly, you should check their relays, which are located on the left side of the engine compartment (see photo).
Thermal switches and temperature sensors (all models) - seal
1. Depending on the model and equipment of the machine, there may be various thermal switches and temperature sensors on the thermostat housing.
2. When installing a new thermal switch or sensor, it is necessary to coat its threads with a suitable sealant (Loctite Fornseal or similar) so that there is no coolant leakage.
Antifreeze - general information
1. For a certain period of time (until the end of 1992) the manufacturer recommended a different concentration of antifreeze depending on whether the engine was turbocharged or not (see specs). A mixture containing 50% antifreeze is currently recommended for all engines to provide freeze protection down to -35°C.
Water hose clamps (405 turbo models) - a common part
1. Since mid-1991 on 405 models with a turbo engine, the hoses are attached to the radiator and expansion tank without the use of clamps. Instead, at the ends of the hoses there are special nozzle-clamps equipped with sealing rings.
2. To disconnect the hose with a new type of clamp, turn the clamp counterclockwise and pull it out of the nozzle on the engine, radiator or expansion tank.
3. Before installing the hose, check the nozzles for deformation and broken clips. If at least one of the nozzles is damaged or deformed, the hose must be replaced, because. nozzles cannot be replaced individually. If the O-rings are damaged or deformed, they must be replaced.
4. Before inserting the hose nozzle into the nozzle, apply a little sealant to the O-ring, then insert the hose and turn the nozzle clockwise to lock it.
Water hose clamps (205 models since late 1992) - general information
1. During a certain period of Burden (since the end of 1992) some models with the XU07 engine used a new type of radiator hose clamps. The clamp of the new type is shown in D / fig. 8.15.
2. To disconnect the hose, first remove the spring clip (you can use pliers to remove the retaining rings for this).
3. Disconnect the hose from the radiator branch pipe and remove the O-ring.
4. Before installing the hose, first insert the spring clip into the notches. To do this, you must first partially install the clamp in one of the notches, and then gradually insert it into the remaining notches.
5. Dip the O-ring in coolant and fit it into the groove at the end of the hose. The ring soaked in coolant will be easier to install - other types of lubricant cannot be used.
6. Bring the hose to the fitting on the radiator, properly aligning the three retaining tabs, and insert the hose into the fitting until it snaps into place.
7. Gently pull on the hose to check that it is securely in place.
Thermostat (latest models) - general information
1. Since the end of 1992, all engines are equipped with an 83°C thermostat.
2. A new thermostat can be identified by the colored dot on the main body. On all models except 309 with XUD7T engine this dot is green, on 309 models with XUD7T engine it is white.
Fan thermal switches (latest models) - general information
1. Since the end of 1992, thermal switches and coolant temperature sensors have been standardized on all engines. The operating temperatures of thermal switches are specified in the Specifications.
2. On non-air-conditioned models, the thermal switches have a mauve stripe instead of red on the housing.
3. On models with air conditioning, the coolant temperature sensors have a white connector bracket.
Loss of coolant through fuel filter heater hose
1. On models without a modified fuel filter, the filter heater hose may rub against the timing belt housing, causing coolant to leak. To prevent this from happening, check that the hose is correctly seated in its clamp and that the filter housing is positioned so that the hose does not touch the timing belt cover.