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To change the thermostat on a 1986 Volvo 240DL, first, ensure the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator, then locate the thermostat housing, which is typically at the end of the upper radiator hose. Remove the housing by unscrewing the bolts, take out the old thermostat, and clean the surfaces before installing the new thermostat with the correct orientation. Reassemble the housing, refill the coolant, and reconnect the battery.

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2w ago

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