Jeep 5093911AA Water Pump

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Start by disconnecting the battery's negative terminal and draining the cooling system. Remove the coolant reservoir/windshield washer reservoir assembly on V6 models, as well as the cooling fan(s) and shroud. Take off the drivebelts and water pump pulley, and on 2.4L four-cylinder engines, remove the timing belt, timing belt idler pulley, camshaft sprockets, and rear timing belt cover. For 3.7L V6 engines, detach the lower radiator hose from the pump. On 4.0L engines, remove the air filter housing and the right engine mount through-bolt. Use an engine hoist to raise the engine slightly and secure it in place with a jack.

There are several ways to check the operation of the water pump while it's installed on the engine. If the pump is defective, it should be replaced with a new or rebuilt unit. Water pumps are equipped with weep or vent holes. If a failure occurs in the pump seal, coolant will leak from the hole. In most cases you'll need a flashlight to find the hole on the water pump from underneath to check for leaks. If the water pump shaft bearings fail there may be a howling sound at the front of the engine while it's running. Shaft wear can be felt if the water pump pulley is rocked up and down.