Toyota Highlander Service Manual: Inspection

1. INSPECT WATER PUMP ASSY

(a) Visually check for drain hole coolant leakage.

(b) Turn the pulley, and check that the water pump bearing moves smoothly and noiselessly.

If the bearing moves roughly or noisily, replace the water pump assy.

(c) Visually check the air holes for coolant leakage.

If leakage is found, replace the water pump assy.

if engine coolant has leaked onto the timing belt, replace the timing belt.