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The engine computer looks at coolant temperature and based on what it sees sends a signal to the fan controller to spin the fan. That controller is a Pulse Width Modulation (PWM) controller, and controls the speed of the engine cooling fan. Additionally, there is an override for Air Conditioning (A/C). Whenever the A/C is engaged the cooling fan(s) runs ...


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Overheating and spitting coolant are both possible symptoms of a blown head gasket. Do a cylinder leakdown test to either confirm or eliminate the head gasket as the source of the problem.


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Huh? Not sure I totally agree with Solar Mike here. He's right, a pocket of air in the fuel line will definitely stop flow. But the term "Vapor Lock" typically involves overheating of fuel in the fuel line to the point where it vaporizes from liquid to gas. And as a gas, you are not going to be able to keep that vehicle running. Typically vapor ...


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An engine shouldn't be replaced for preventative maintenance, unless you are willing to spend thousands to avoid a repair that may be as simple as an air bubble in your cooling system. Get a diagnosis first, then go from there.


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No, not to do with the fuel pump - at least not for the cooling system. Vapor lock can be for any pipe wehere the flow is stopped due to a pocket of air. Poor bleeding or burping of the cooling system can cause overheating so it is something that has to be done correctly. Vapor lock can also happen in fuel systems and has often been an issue with ...


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