A failure in the water pump can cause engine damage due to overheating. The water pump is driven by the balance shaft chain on four-cylinder engines and by the timing belt on 3.0 V6 models. It is located beneath the timing cover on all models, making leaks harder to detect. However, coolant coming out of the lower timing belt cover can indicate a leak. Water pumps have weep holes, and if the pump seal fails, coolant will leak from these holes. To check for leaks, the timing belt cover needs to be removed, and a flashlight and small mirror can be used to locate the hole on the water pump from underneath. If the water pump shaft bearings fail, a howling sound may be heard while the pump is running, and shaft wear can be felt by rocking the water pump pulley up and down. Even if a water pump shows no signs of a problem, it may still need to be replaced as the fins on the back of the impeller can erode, reducing cooling efficiency. Therefore, it is recommended to replace the water pump whenever the timing chain or timing belt is replaced.