It turns out it was a bad radiator cap that couldn't hold pressure.
Topped off the coolant and put on a new radiator cap and it seemed to
take care of it. You have to love something you can fix at 7:30 pm on
a holiday by going to walmart to get a $5 part. Granted they only had
a 16 psi cap instead of the 20 that is spec'ed but it seems to be
working and will get me by until I can get the right one. The rubber
seal was torn on the old one. Hopefully this was the true problem and
this is an easy/cheap fix.
Thanks all,
Ted
On Mon, May 30, 2011 at 10:06 PM, David Gersic
<info@zaccaria-pinball.com> wrote:
>
> On Monday 30 May 2011 18:42:36 you wrote:
> > I have a 2002 QC with the 4.7 and it was overheating on the way home
> > tonight. At anything less than 60 mph it would run hot, at less than
> > 10 mph it would go to the top of the temp scale.
>
> Could be a failed t-stat. I had a Buick do that to me once. I'd look there,
> first, before pulling the radiator or the water pump.
>
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