Note: See warning in paragraph 1 this chapter.
Examination
1. A pump failure can cause serious damage to the engine due to overheating.
2. There are three ways to check the operation of the pump installed on the engine. If the pump is faulty, it must be replaced with a new or repaired one.
3. After the engine has warmed up to normal operating temperature, pinch the upper radiator hose. If the pump is working properly, you should feel a jolt when you release the hose.
Warning: Keep your hands away from the electric fan impeller!
4. Remove the timing belt covers (chapter 2A). The coolant pump has a vent hole. If the pump seal is faulty, coolant will leak out of this hole. Using a flashlight, you can locate the holes on the pump to check for leaks.
5. On models with 4-cylinder engines, the pump is located on the timing belt side and to check for leaks it will be useful to remove the timing covers (chapter 2A).
6. On V6 models, the pump is located on the transmission side. To check for leaks, it may be helpful to remove the pump drive belt cover. Also inspect the belt for traces of coolant.
7. If the pump shaft bearings are faulty, this can be determined by a whining sound coming from the accessory drive belt as the engine rotates. Shaft wear can be detected by rocking the pump pulley up and down. Do not confuse the whining sound caused by the accessory drive belt slipping, which is a whining sound, with the whining sound caused by faulty pump bearings.
Removal
4-cylinder engines - models produced before 06.1998
8. Drain the cooling system (chapter 1).
9. Remove the engine oil dipstick. Disconnect the coolant hose from the exhaust system heat shield. Remove the lower and upper bolts, taking into account the position of the coolant hose. Remove the heat shield from the front of the engine.
10. Remove the timing belt and its tensioner (chapter 2A). As stated in this chapter, if the belt is contaminated with coolant, it should always be replaced.
11. Now you need to remove the front engine mount, lifting it using a lifting device.
12. Remove the 3 bolts securing the front engine mount to the subframe. Then lift the engine approximately 20 mm.
13. Disconnect the lower radiator hose from the pump connection. On models with air conditioning, this connection is easier to access when the power steering pump has been removed and moved aside as described in Chapter 10 (see Fig. 8.13). It is not necessary to disconnect its hoses.
14. Unscrew the bolts and remove the cooling system pump (see Fig. 8.14,a,b). If the pump needs to be replaced, unscrew the bolts of the toothed belt guide pulleys and transfer them to the new pump.
4-cylinder engines - models produced since 06.1998
15. Drain the cooling system (chapter 1).
16. Loosen the pump pulley bolts.
17. Remove the accessory drive belt (Chapter 1), then remove the pump pulley.
18. Remove the toothed belt and the upper idler pulley (chapter 2A). If the belt is contaminated with coolant, then in this case it should always be replaced.
19. Apply the parking brake. Raise the front end and place it on supports.
20. Disconnect the coolant hose from the pump from under the vehicle.
21. Remove the two pump bolts. Remove the pump from the engine compartment. Remove the gasket.
V-shaped 6-cylinder engines
22. Remove the battery (Chapter 5A).
23. Drain the cooling system (chapter 1).
24. Unscrew the screws and remove the pump drive belt cover, installed on the engine from the front at the top (see Fig. 8.24, a, b).
25. To loosen the belt, turn the belt tensioner clockwise and remove the belt from the pulleys (see Fig. 8.25). If you are going to reinstall this belt, mark it so that after installation it rotates in the same direction.
26. To access the pump, disconnect the coolant hoses, remembering their position. Release the wiring from the fasteners on the pump and move it to the side.
27. Unscrew the three pump bolts. Remove the pump from the engine compartment (see Fig. 8.27, a-c).
28. The impeller housing is secured to the pump housing with five bolts (see Fig. 8.28,a). At the time of writing, the impeller was not supplied separately from the pump (nor was its gasket). Therefore, if the pump is noisy or leaks, the entire unit must be replaced.
Installation
29. If you have removed the impeller housing, thoroughly clean the mating surfaces. The gasket must always be replaced after removal (see Fig. 8.10). When installing, fix the new gasket in place with grease. Install the impeller housing on the pump and tighten its bolts to the required torque.
30. Install the pump in the reverse order of removal and tighten its bolts to the specified torque. Fill the cooling system (chapter 1).