Question about 1989 Oldsmobile Cutlass Ciera
Follow the upper radiator hose. Where it connects to the engine is the thermostat housing. Unbolt that housing and the thermostat is under there.
Posted on Feb 10, 2012
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Posted on Jan 02, 2017
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Thermostat Operation:The automotive thermostat is a temperature controlled on and off valve. When the temperature rises to a predetermined temperature, the thermostat opens up to allow the engine coolant to flow through the cylinder block and the radiator. This flow is crucial to maintain optimum operating temperature for fuel efficiency, enhanced driveability, and engine protection. The coolant flow is reduced when the engine is cold, and the flow is increased when the engine is hot. Contrary to popular opinion, operating the vehicle without the thermostat doesn't make the engine run cooler. It will actually run hotter because there isn't a thermostat to slow the coolant flow. This means the coolant doesn't stay in the radiator long enough to dissipate its heat.
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