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Originally Posted by Dbear
I've got a coolant leak on my 98 GMC Sub. Oddly enough, a CEL code made me check the water level, and that led me to find the problem. (My wife and son normally drive this, so I don't keep too close an eye on it.)
The leak is coming down below the block, so my first thought was water pump. But the shaft doesn't wobble, there's only a little discoloration around the weep hole (and I didn't see anything come out), and there's just a little water near the end of one of the splines. I just discovered this forum (which may be the silver lining in this cloud), and shortly after discovered the intake manifold problem. I have a sinking feeling that's it...
I think I can borrow a coolant pressure tester from Autozone. If not, I'll probably buy one. If it is the intake manifold, where should I be looking? Near the bottom of the valley, either front or back? I peered around pretty well last night, and couldn't see anything, but I didn't know about the manifold problem so I may not have been looking in the right place. I certainly wasn't looking towards the rear, but the leak is coming down towards the front.
Any helpful advice on how to pinpoint this?
And does anyone know a good "Let It Be the Water Pump Not the Manifold Gasket" dance???
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check for leaks after the vehicle sits overnight....use of an adjustible mirror works great....with a powerful light ...
your problem could be a gasket, and it could also be corroded metal...If the gasket is replaced make sure you repair any corroded metal before installing the gasket ...
use of non dexcool coolant with dirty drinking water will cause these problems as well as insuffecient ratio of coolant /water mix...
drain the coolant system completely 4.5 gal....then use distilled water with the coolant...