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Where is the thermostat located on a 1995 Oldsmobile Achieva 2.3L 4 cylinder DOHC?

The thermostat on a 1995 Oldsmobile Achieva 2.3L 4-cylinder DOHC is located at the rear of the engine, on the engine block, near the cylinder head. It's not easily accessible and requires removing various components to reach it. You'll likely need to consult a repair manual with diagrams specific to that vehicle year and engine to pinpoint its exact location and the removal procedure. The repair manual will show you the specific location and what needs to be removed for access.