Glossary of Auto Terms

DriverSide's Car Dictionary has the most comprehensive definitions of automotive terms. This auto glossary can help you decipher what your mechanic is fixing and what the purpose or function of the particular auto part or accessory is for. We have taken the mystery out of automotive service jargon, so that you don't have to.



The thermostat is like a gate that remains shut until the coolant reaches a set temperature, at which point it opens and lets coolant pass. Its basic function is to allow the engine to warm more quickly.

See Also:
Flushing Tee
Radiator Cap
Thermostatic Switch

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