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Firstly remove the thermostat from its Housing Assembly, usually held down by 2 or 3 bolts depending on the model of vehicle. Boil a pot of water whilst immersing the thermostat into boiling water, you will notice the centre rod pullback in the direction of its spring, opening a larger hole within the thermostat device. If the hole is visibly opened, the thermostat is operating as required. If you are experiencing Over Heating, good idea to check the Clutch-fan is operating normally. Over heating in the EA and EB models is either one of 4 things needing attention, Clutch-fan, thermostat, Radiator and/or Head or Head gasket. Dont remove the thermostat from these models as the onboard Computer requires these for sensors to operate correctly.

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15y ago

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