Blown Water pump

[Martin Powlette]

Tell me a bit more because the heater core was leaking and the unit was
bypassed so the line off the intake manifold(pressure) which would normally
go to the heater core flows right back into the rad.

T Hergen wrote:

> If doubt the following in itself would cause a failure, but it
> can't hurt to check...
> If there is a heater core water cutoff valve (usually actuated
> when the A/C is switched to max), make sure it isn't installed
> backwards.  When properly installed, the water still flows to
> the valve and back to the engine when the valve is actuated.
> If backwards, the flow through the heater hoses is stopped
> completely when the valve is actuated.
>
> Mine is now mounted upsidedown because the mechanic who replaced
> my heater core switched the 5/8" and 3/4" extensions.
>
> Tom
>
> On Sun, 13 Sep 1998, Martin Powlette wrote:
>
> > Sorry about the non group related content of this message, but I need
> > some great minds.
> > About two weeks ago I replaced a water pump on a small block V8
> > chevy1993 the customer said he had changed one some time back but I did
> > not bother to ask how long ago. He shows up today and the new pump
> > (2weeks old) is leaking again through the same breather hole in the
> > pump.  When I replaced the new pump I also replaced thermostate & rad
> > cap all AC Delco.  He now gives me the history ..... this is the third
> > pump in less than 9 months.  I am lost for ideas.  Is there a GM
> > bulletine covering this defect or is something wrong elsewhere.
> >
> > Martin
> >