MR2 Cooling System Bleeding

If cooling system needs refilling, ensure radiator and engine drain cocks are tight. Leaving air bleed valves open, connect length of clear hose to radiator and heater air bleed valves. Suspend other end of hose from hood and hood stay. See Fig 1 and Fig 2 .

Fig 1: MR2 Cooling System
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Connecting Hoses to Radiator & Heater Air Bleed Valves
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Ensure engine air bleed valve is open. Refill with 50/50 mix of ethylene-glycol based coolant and water. When coolant begins to flow out of engine air bleed valve, stop pouring and close engine air bleed valve.
Ensure coolant level is at top of radiator cap filler neck. Ensure coolant level in suspended hoses are at the same level as the radiator cap filler neck. Close radiator and heater air bleed valves. Remove hoses.
Install radiator cap to first stop point only. Start engine. Run at fast idle for about 3 minutes. Turn off engine. Recheck coolant lever. Refill coolant, if necessary.
Install radiator cap. Fill coolant reservoir tank to "FULL" mark.