Question about 1989 GMC K2500

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89 gmc 5.7 cooling problems

I have replace everything from the radiator to the sending units, With a 195 thermostat it seems to run at approx. 200 to 210 degrees, and that is with a little hole drilled in the thermostate, What is normal operating temperature, Also why would opening up the breathing of the vehichle make the intake manifold leak oil. I just dont get it....

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Hi! Screw-1
Some times I even get a little confused when the temperature gage in the cabs are not as accurate as we would expect. If you leave the radiator cap loose and put a thermometer in the coolant, or better yet ask around and find a infrared thermometer (you can leave the cap on). Check this reading at both ends of the radiator. Even if the water is at 210 degrees F, at the inlet from the top hose, as long as the coolant is at a lower temperature at the opposite end, this should be fine. If the radiator cap is leaking you may want to make sure the cap is ok.

If the gaskets are old, the pressure change with the breather off may indicate the PCV valve is not working properly. I believe the crankcase breather is still in the air breather. The combination of problems as well as excessive blow by will also cause leaks.


Posted on Oct 26, 2008

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