6. COOLING SYSTEM UXV 500 Install a new O-ring into the housing cover O-ring groove. Install the housing cover and housing stay to the housing. Tighten the bolts securely. Install the housing stay to the frame. Tighten the nut securely. Fill the system with recommended coolant and bleed the air (refer to the "COOLANT REPLACEMENT" section in this chapter). Thermostat 6-10