Mopar 4667660AB Water Pump

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A failure in the water pump can cause serious engine damage due to overheating. There are three 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. Some small black staining around the weep hole is normal. If the stain is heavy brown or actual coolant is evident, replace the pump. If the water pump shaft bearings fail, there may be a howling sound at the front of the engine while it's running. With the engine off, shaft wear can be felt if the water pump pulley is rocked up-and-down. Don't mistake drivebelt slippage, which causes a squealing sound, for water pump bearing failure. A quick water pump performance check is to put the heater on. If the pump is failing, it won't be able to efficiently circulate hot water all the way to the heater core as it should.

If the water pump shaft bearings fail, a howling sound may be heard at the front of the engine while it's running.

The remainder of the installation is the reverse of removal. Refill and bleed the cooling system when you're done. Then run the engine and check for leaks.

Clean the bolt threads and threaded holes in the engine to remove corrosion and sealant.