When this happens, the result can be extremely damaging, resulting in thousands of dollars in engine damage. Engine overheatingĮngines generate an enormous amount of heat and as a result are subjected to very large temperature swings if this switch does not operate effectively. Several symptoms may point to a bad or failing thermo coolant fan switch. There are many other engine systems which are also indirectly affected by the operation of this switch, but in the context of this article we will focus on its relation to the operation of the coolant fan. Think of this switch as the “gate keeper” to the temperature regulation in your vehicle’s engine. Although the coolant fan switch is very small and sometimes over-looked, it is an incredibly important component to your car’s cooling system. Once the temperature reaches this cooling stage, the coolant fan will shut off. The coolant fan will continue to run until the engine temperature cools down to a specific predetermined level. As engine temperature rises to a specific threshold, the switch is activated powering on the coolant fan. This switch is configured to work based upon the temperature of the engine. A coolant fan switch is a small and very simple switch comprised of typically two wires.
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