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How do you replace the thermostat located on a 1991 Oldsmobile Cutlass Ciera?
Wiki User
∙ 18y ago
Wait until the engine is cool before attempting to change the thermostat. Remove the radiator cap to release any built up pressure in the system. Follow the top radiator hose to where it connects with the engine block. Remove the hose from the elbow. Now remove the 2 bolts holding the thermostat housing. Once the bolts are removed, remove the elbow from the connector. This may take a little prying. Once this is removed, you'll see the thermostat. Notice that the thermostat has the spring pointing downward toward the motor. If the thermostat has a rubber seal, you can carefully remove it and put it onto the new thermostat, place it back into position. If the rubber seal is cracked or broken, put on a gasket and gasket sealer to avoid leaks. If there is no rubber seal, you will need to place the thermostat in position, and then put on a gasket and gasket sealer. Bolt the elbow back on (this does not have to be cranked to death, just make sure it's tight). Reconnect the radiator hose. Put the radiator cap back on. Start the car and drive it, keeping an eye on the temperature to make sure everything is Ok
Wiki User
∙ 18y ago
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