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Severl things it could be if it's overheating raditor may be clog or crack or warp heads then it could be something simple like raditor cap or the thermostat even a simple oil change just have to find and test these things before you rule out what it is.
Low coolant
Cooling fan not working
Radiator plugged or air flow restricted
Defective thermostat
Collapsing radiator hoses
System "airbound"
Defective radiator cap Many things can cause engines to overheat, but it all boils down to two things: lack of coolant because of a leak or lack of proper flow. The most common cause of overheating is a bad thermostat. It could also be caused by a bad water pump not circulating the coolant. If it is leaking coolant there are many hoses and gaskets it could leak from.
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