Glossary of Automotive Components/Terms

Thermostat, Engine

Engine thermostats are a big cause of poor gas mileage and poor engine performance. 
A thermostat is a valve located in the engine that prevents the engine coolant from circulating through the radiator until the engine temperature reaches a predetermined temperature, about 190 - 195 degrees Fahrenheit on most cars. After this temperature is reached the thermostat attempts to keep the coolant flow to the radiator regulated to maintain proper temperature, about 190 - 220. A tired thermostat that won't maintain proper temperatures can cause many problems, such as poor mileage, pinging, hesitation and surging as well as engine damage and oil sludging.
Although they often stick closed and cause overheating, the most common failure is opening too soon or sticking open and causing the engine to run too cool.
This can start happening after only two years, so our recommendation is to replace them every 2 - 3 years.Engine Thermostat
When purchasing one, make sure you ask for the manufacture's recommended temperature, usually around 195 degrees. .























 

 

 

 

 

 

 

 

 

 

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Wayne's Garage
27 E 27th in Eugene, Oregon
333 Q Street in Springfield, Oregon