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Air in cooling system. Bleed the system.

Thermostat installed upside down or it is defective. Replace the thermostat and install it spring toward engine.

Cracked head. Head should have been inspected by a machine shop.

Head bolts not torqued to the correct factory torque specifications and gasket blew again. Check the torque and if they are loose you will have to do it all over again.

Water pump or cooling fan defective which was the cause of the overheating and gasket blowing in the first place. Check cooling fan for proper operating. Check pump to see if it is actually moving coolant throughout the system.

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Q: What causes car to run hot after changing head gaskets?
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