The original thermostat installed at the factory does one thing, but it does it remarkably well. Simply put, its role is to respond to temperature changes in the engine coolant. If the coolant is cold, the thermostat remains closed and keeps it in the engine. When it gets too hot, the thermostat opens to allow the coolant to flow back to the radiator and get cooled down again. How does the thermostat know that the coolant is too hot? It has a unique wax that acts as an expanding agent. When the fluid gets to a specific temperature, the wax expands, and the thermostat valve opens to allow the coolant to travel through the hoses to the radiator.
Signs of a Failing Thermostat
Thermostats are quite durable. In fact, it's not unheard of for people to own their car or SUV for a decade without needing to replace theirs. However, they're not infallible. If you're concerned yours may not be working right, there are some signs to look for. Your first clue will be the "Check Engine" light coming on. If the thermostat valve stops operating properly, it can't open to release the coolant. If that's the case, you may experience engine trouble, or a HVAC system that stops properly cooling and heating the cabin. Run an inspection to be sure that the thermostat is the source of the trouble. If it is, it's smartest to replace it with a genuine GM thermostat that's designed to work with your systems. They're available for online ordering from our auto parts department. Order yours now and save!
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