Boiling over...

[suburbanstevie]

What size engine?
let me tell you my tale of overheating blues. changed every component that even so much as touched coolant, at least twice! Dealer was a complete waste of time because all he did was plug in his scan tool and said "yeah it's hot, but isn't throwing any trouble codes."
Was almost gonna junk it. BTW it's a '90 Suburban, 454, 2wd. A friend suggested an independant mechanic, so I figured I might as well drop another $100. He quickly determined that the bushings on the distributor shaft were totally shot. The bushings are like the "bearings" for the shaft. it turns out that the bad bushings was causing the timing to be very messed-up with some of the cylinders firing as much as 10 degrees off!!! this was forcing me to press on the pedal more, giving it more gas and heating up the engine more especially when I was pulling a trailer.

This is a relatively easy repair for a mechanic. A whole new distributor shaft assemlby is relatively inexpensive.