6. COOLING SYSTEM MXU 500 IRS INSPECTION Visually inspect the thermostat for damage. Thermostat Heat the water with an electric heating Thermometer element to operating temperature for five minutes. Suspend the thermostat in heated water to check its operation. Keep flammable materials away from the electric heating element. Do not let the thermostat or thermometer touch the pan, or you will get false readings. Replace the thermostat if the valve stays open at room temperature, or if it respond at temperatures other than those specified. Thermostat begin to open: 80-84°C (176-183°F) Valve lift: 8 mm (0.3 in) minimum at 95°C (203°F) Air Bleed Hole INSTALLATION Install the thermostat into the housing with its air bleed hole facing up and aligning bleed hole with the tab in the housing. Tab Align 6-9