I replaced a water pump my 1999 Suburban. For those that don't know, the water pump is located behind the Fan (it's what the fan is connected to).
Suburbans are infamous for going through Coolant so its good to check the radiator fluid and reserve tank every month. Awhile back, I checked and my radiator was very low (i didn't think nothing of it, cause I didn't check for a few months). So I topped it off and a few weeks later I checked again and sure enough it was low and I saw the inside grill of the radiator so I knew something was wrong.
Fortunately, I have one of these bad boys which I hooked up and pressured the system and started getting a leak from the passenger side of the radiator. I actually at first thought it was the radiator that was leaking however after I removed the skid plate I realized the dripping was actually coming from the water pump. The water pump fails at two spots either the gaskets or there is a little hole at the top that begins to drip when the pump fails--mine was a gasket failure.
I watched 4 different youtube videos on taking the water pump first to get some tips; this video was the best.
The hardest part was taking the bloody fan off! I COULD. NOT. TAKE. THAT. SONAVABITCH. OFF! I tried everything but the fan belt on the pully kept slipping. So I ended up just taking the water pump off and taking the fan with it. Once I had the water pump off, I put it into a vice and was finally able to loosen the fan off.
For the gaskets, I put some atv/red silicon on both sides of the gaskets and make sure to put some silicone on the ends of the bolts as I put the new pump back on to prevent any water from seeping through.
I put her back together and burped the system (in the above picture that yellow container in the radiator that's what that is for to make pouring the coolant in easier). It took about 15 minutes of the truck running before the termostat to finally kick on and circulate through the system.
I pressurized it again and it held it's pressure.
Here is the old water pump
It was actually alot of fun (other than the frustration of taking the fan off) and the pump for these older vehicles aren't as scary to take off as you would think. The shop would have charged me 400$+ I did it for the cost of the pump and the lower radiator hose (I replaced the lower radiator hose because the coolant that leaked on it compromised the rubber.