Quote Originally Posted by WhiteDevil View Post
if its stuck open the temp gauge will read low temps.


This is a VERY common GM problem that usually is fixed with a good back-flushing of the heater core.

If you need a HOW-TO let us know, one of us will post it up. Its fairly simple to do and takes only 10 minutes.
I'm not the one with the problem, but I wouldn't mind seeing a how to.