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First and foremost is to check the system for a leak. A system pressure check should be done. This can be done with a pressure tester. If you do not have access to one, you can usually rent one from most local big-chain parts stores. Pump up the system and watch the gauge. It should hold steady for a minimum of 5 minutes. If the gauge moves, there is a leak. While the system is pressurized check the system for any signs of a leak. If none are found, the problem may be internal, like a faulty head gasket.
If the system pressure holds and there is no leak, then next the cooling fan should be inspected to make sure it is kicking on at about half-way on the temp gauge.
If the cooling fans are working, next is to check for coolant flow. With the engine running, check to see if the coolant is circulating correctly. If not, this can be a failed water pump or a clog in the system.
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