Had no idea the pump was gear-driven, and was in. This is part of a previous thread about a coolant leak and identifying the water pump. I have (happily) not experienced the issues that come with it, but was quoted for a 700 repair (replace the water pump). While the car was in the air, I was told there is a coolant leak coming from the water pump. Im firing off as many flares as I can because these forums are a fantastic resource for experience and expertise. I just did my first oil change since running out of warranty last month (just passed the 160,000km). These two schemes are not interchangeable. This is a cut and paste from a post on the Duramax Forum. Also I seem to remember that there are two kinds of water pump gaskets - flat paper type and metal with embedded rubber. Some of the bolts go into the water passage so you really should put sealant on the threads. As said, they are right next to the pump and will be fragile if they are still the original ones. Technically you can R&R water pump without removing the bracket and elbows though it seems to me there is much easier access if you do. Aftermarket aluminum elbows are available- these aren't invincible since they are made by Dorman, but if you dream of keeping the car longer than 15 more years go for it.
#Coolant leaking from water pump gasket crack
The OEM elbows are black plastic and much like a plastic radiator tank, will crack after 15 years or so. This is a very common place for coolant to leak on the 3.8. One goes into the end of the manifold and the other one goes into the timing cover right next to the water pump. There are then two plastic elbows that fit into the bracket and couple the flow toward the engine. The coolant for the heater flows through that part around to the pulley and belt side of the engine just above the water pump. The heater hoses attach to the back of the alternator bracket / belt tensioner assembly. I tightened everything down with the new gasket so what could possibly cause this new leaking? I just turned off the vehicle and came home to post this before further proceeding. The pump/pulley was now spinning properly but after several minutes, coolant was seeping out from the pump. So I then started with the overflow tank cap open and let it run for a few minutes with the heat on. I had no idea how much was in the system AND I filled in the overflow tank (assuming this was another mistake?). I was able to scrape off the old gasket with a metal wire brush so that I had a clean surface and installed the new pump, reinstalled the pulley and the belt and then filled with nearly a gallon total of new coolant and distilled water. They weren't open at the time so It basically just drained out onto their lot as I was removing the old pump (mistake). I bought a new water pump and installed it without properly draining the coolant. Fortunately, this happened a block away from an Advance Auto so we were able to get it to their parking lot. A few days ago, our 2003 LeSabre threw off the serpentine belt because the water pump/pulley was rattling and spinning unevenly.
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