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91RS [ EDIT: Actually I just thought of something, but it isn't really good news. There is a problem with some heads manufactured by Castech and they can have a porosity crack in them which will cause coolant loss without any outward evidence of a leak. If that's the case, then you'll need a...

91RS Thanks again. Problem started about 4 months ago. First noticed when truck warned me of overheat. Temp got to about 250 degrees, but was taken care of right away. The coolant level was one gallon low. Added coolant, and initial overheat problem went away. Pressure test done at that...

Thanks Thank you for your replies. What would you expect for labor to replace the water pump? More than 2 hours? Can I assume that it is not a head gasket if the oil remains in good condition? I have had to add more than a gallon in the last month. Oil changed 2 weeks ago. Summary...

2004 Tahoe LT 5.3 85,000 miles. I am losing coolant fairly quickly. Recently changed thermostat because it was overshooting to about 230 degrees before it would open and cool down. Mechanic did a pressure test and saw no problem. Oil appears uncontaminated. No fliud on garage floor...