Can the Coolant Be Filled to the Top?

1 Answers
VanQuinn
07/25/25 7:13am
Coolant should not be filled to the top, as the excess coolant will overflow from the pressure relief valve due to thermal expansion and contraction. The coolant level should be maintained between the upper (MAX) and lower (MIN) marks. Coolant Replacement Method: Before completely replacing the coolant, conduct a thorough inspection to check for any signs of leaks or cracks in the pipes, with a particular focus on the five-way hose. The five-way hose is named for its five connections to different parts of the vehicle. The coolant flows through the five-way hose and is then distributed to various parts of the car to perform its function. If there is any leakage of coolant in this section, replace the hose or resecure the connections as needed. Drain the old coolant, then flush the liquid channels with clean water. Add clean water to the coolant reservoir and continue filling until the water flows continuously through the engine cooling system. Start the engine and let it idle for 3 to 5 minutes to circulate the water. Initially, the water draining from the reservoir will have a faint pink tint. Continue adding clean water until the outflowing water is clear. Note: Remember to disconnect the heater hose and drain the water from the heater core. After draining for about an hour, add the new coolant through the radiator hose to allow it to flow quickly into the radiator. Then, add another container of coolant to the reservoir until it is nearly full. Start the engine and let it run for about 10 minutes. During this time, the coolant level will drop slightly as air is purged from the cooling system. Top up the coolant to the "MAX" mark on the reservoir.
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