Question about 2003 Jeep Grand Cherokee
What are signs of a cracked head?
First of all, don't "disable" the thermostat, It is an important part of the cooling system. Without it, you could crack the cylinder head from coolant boil-over! Ok, the most obvious sign of a cracked/warped head, or gasket failure is white smoke at the tail pipe, air bubbles in the cooling resivoir, milky, thick, coffee with cream colored oil, or external coolant leaks. If you just have an overheating problem, you should investigate the cooling system first. Check the fan(s), there may be a belt driven and an electric fan for your truck, make sure they both are operating. (turn the ac on with the engine warmed up) Check that when at operating temperature, shut the engine off and make sure the belt driven fan has resistance when you turn it by hand. If it turns and spins freely, replace it. Flush your radiator with a good coolant flush chemical and follow the directions. When flushing, look for water flow in the radiator cap. Replace that thermostat with a new one! replace the coolant cap also. Check for debris on the radiator fins like leaves, plastic bags, mud and bugs.
Posted on Feb 22, 2012
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Posted on Jan 02, 2017
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