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Before replacing the thermostat, it is necessary to merge the Opel Corsa D antifreeze cooling system. The hose must then be removed from the thermostat tube, loosing the handle on the thermostat. The tube in which the thermostat is located is secured by three screws to the water pump. You'll get access to the thermostat. To detach the thermostat from the patter, you must turn the thermostat in the direction counterclockwise.