Question about 2001 Cadillac DeVille

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I bought a 2001 cadi deville w/ a northstar engine.Drove car at night when it was about 60 degrees for about an hour it drove great. Next day it was very hot out and drove for an hour and car overheated. Each time its driven in the heat after an hour it overheats but not while just sitting and let run. I replaced the thermostat and its doing the same thing.If you do a head gasket test, should the blue fluid turn yellow and stay that color?Should the fluid change color right away or does the car have to overheat for it to change from blue to green or yellow? if your car runs for an hour and one side is hot and the other side is cold does it mean your radiator is bad?

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Hello, The blue fluid will turn yellow, once you use the fluid throw it away. Do not mix it with the good fluid left over. I have never kept it long enough to see what happens later. It also sounds like you have a plugged radiator. Someone may have put stop leak to try and cover up a leaking head gasket.

Posted on Oct 05, 2010

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