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To change the thermostat on a 1991 Mercedes 350 Diesel, first ensure the engine is cool and disconnect the battery. Drain the coolant from the system and remove the upper radiator hose connected to the thermostat housing. Unbolt the thermostat housing, replace the old thermostat with a new one (ensuring the correct orientation), and reassemble the housing and hose. Finally, refill the cooling system with coolant, check for leaks, and reconnect the battery.

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3d ago

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