What is considered a sign of improper antifreeze concentration?

An upper radiator hose collapse indicates a sign of improper antifreeze concentration due to inconsistent pressure within the cooling system. When the antifreeze concentration is off, either too much water or not enough antifreeze can lead to a drop in boiling point and an increased risk of overheating. This improper mixture can also cause the coolant to experience issues like freezing in colder temperatures, or not providing enough protection against corrosion.

A collapsed upper radiator hose typically signals that there's excessive suction from the radiator under certain conditions, which can occur when the antifreeze concentration is not appropriate, leading to a vacuum effect. This phenomenon may arise particularly when the engine cools down and the liquid contracts, pulling a vacuum on the hose, resulting in its collapse. Furthermore, maintaining the correct antifreeze concentration is essential for ensuring the longevity and functionality of the entire cooling system.