Coolant leak came back after replacing water pump

[Zane Elston]

Hi all,

 

About 4-5 months ago, I bought a 2002 Yukon XL, and it was leaking coolant a day later, so I took it to my dad's repair guy, and he replaced the water pump. about 5,000 miles later, i got a low coolant light when I was running the AC in town, so I topped it off, and it didn't come on for a while. This past weekend I went camping about 4 hours away, and when I started coming back, the radiator started making a grinding noise, like the fan was getting caught up or something, and the coolant light came back on. It smelt like coolant under the hood. I can't tell where its coming from. I refilled it, and that got me home without any low coolant messages, but the radiator still made that sound. Thoughts? Should I call that mechanic again? He's about an hours drive away, and I don't really want to drive it that far if I don't have to. It's not leaking like it did when I replaced the water pump, it just poured out back then, now it still holds most of it.

[Zane Elston]

Could a boil over have caused this new pump to fail?

[Explorer]

New parts fail too. But I would be looking at the overflow tank, lines/hoses/clamps for leaks. Found a pinhole in a radiator hose the other day that only showed up under high pressure

[Duelin]

Anyone near you that can do a pressure test?

[oldmann]

Did you fill the radiator or the overflow tank?

[white1500]

DIY? The cooling system isn't rocket science and you will save $$$ in labor, and can probably get parts cheaper too.

[silveradosid]

you need to pressure check the system with the truck running, noise in the radiator can be air in the system. it could be a head gasket specially if your using coolant and can not find a leak