Overheating Issue

[Eli Lilly]

Originally Posted by YanMinor

I thought the radiator top-off fixed the problem, but I'm certain that I shouldn't have to do this yearly.... The fan still doesn't come on when I run it for several minutes, and I think that it may be problem with the thermostat or the water pump. Does either one sound more likely than the other? Are their corresponding fixes DIYable?
!

I'd guess the thermostat before the water pump. Water pumps usually leak as their failure mode, the only way they quit pumping without having eaten the serpentine belt would be for the vanes to get eaten away, which is very, very, very uncommon with modern engine coolant.

-E