Cost of repair of a number 4 cylinder

Hello, Before you can have the repair estimated, the issue causing these symptoms must be found. You may have a bad thermostat, radiator, or water pump, depending on when it is hot or cool, and there may also be one or more leaks. The check engine light lets you know there are trouble codes stored. If you scan and post the codes here, and let me know if you smell coolant, when you overheat, when you don't, and if you see coolant leaking on the ground, I can better assist you. If you prefer to have the vehicle diagnosed for you, see the link below, and enter 'general diagnostics': https://repairpal.com/estimator/toyota/tacoma