Question about 2003 GMC Sierra 2500HD

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I am a pretty handy man but my question is: How difficult would it be for me to replace my water pump? I don't think the pump is attached to the timing belt but want to know how difficult of a job it would be for someone with basic tools. Thank you

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Hello. If you are handy you can do this job. Take off the upper shroud half, then find a scrap piece of cardboard to cover the radiator.

You need a way to hold the water pump pulley and a wrench big enough to fit the clutch nut. A crescent/open end if you have it and a pair of vise grips to clamp on the back side of the pulley-----but use a buffer of some sort, rubber/old belt/leather to keep from marring the pulley. Channelocks will work here also, it doesn't take alot. All you have to do is get it broke loose, it should spin off after that.

It's right hand threads, so just take it off like you were taking out a bolt on the front end, to the left.

Though not necessary, it's handy to have a pair of hose clamp pliers that fit these clamps.

you can use a stud to put in a couple of the holes, just cut them long enough to be able to get out and replace with a bolt-

make sure you get the block cleaned off well, a thin coat of RTV on both sides of the gasket. This would also be a good time to change the thermostat if you haven't done so in a long time or never.

Put some anti-seize back on the threads of the pump, screw the clutch/fan back on, just snug it back.

Posted on Nov 19, 2009

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