Kia Troubleshooting Questions? Ask a Mechanic
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The 2 main causes it a cylinder head gasket leaking internally in the engine to where exhaust heat and gasses are leaking past the gasket into the cooling system causing an over heat.Any shop should be able to do a block test to see if exhaust gasses are getting into the cooling system with a block tester which usually takes less then an hour to test.If any exhaust is getting into the cooling system then the head gasket needs replaced.
If no exhaust is getting into the cooling system then I would have the computer reprogrammed to see if this corrects the fan speed issues.If it does not then the computer may need replaced and programmed as it may not be controlling the fans properly.
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