What Causes Antifreeze to Boil Over?

1 Answers
AylaMarie
07/29/25 7:31pm
The main reasons for antifreeze boiling over are the following five: 1. The radiator fan fails to operate. The inspection method is to directly turn on the vehicle's air conditioning cooling system. If the air conditioning compressor starts but the fan does not run, the fan must have malfunctioned. 2. Poor radiator cooling, which often occurs in April and May when there is a lot of willow catkins and cotton fluff. Inspection method: Open the engine hood and observe whether there is too much debris on the radiator. 3. If the coolant cannot circulate normally, it cannot perform its cooling function. If both the radiator and the return hose are at room temperature (normally they should be hot), the upper and lower hoses will become hard due to gas expansion inside the hoses. 4. The water pump belt may slip or idle if it has been used for too long. 5. High water temperature may be caused by a malfunctioning water temperature sensor or issues with the instrument panel or electrical circuit.
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