What Causes the Car's Auxiliary Water Tank to Always Lack Water?
2 Answers
The reasons why the car's auxiliary water tank always lacks water are as follows: 1. Cylinder head gasket: Frequent water shortage indicates a leak in the cooling system or a slight cylinder head gasket failure. 2. Overheating: Excessive coolant temperature can also lead to system water shortage, and leaked coolant can be seen from the front of the engine. 3. Water pump seizure: A seized water pump can cause timing belt damage, leading to piston top valve and other related component issues. 4. Cylinder gasket failure: A failed cylinder gasket (air or water passage) can mix with engine oil or be expelled through the exhaust pipe, causing water shortage. 5. Water-cooled air compressor: Leakage due to air compressor steel gasket failure.
I often notice the coolant reservoir is low on water during car use, and there are usually several possible causes. The most common is a coolant system leak, such as aging or cracked hose connections seeping fluid, or tiny cracks at the radiator bottom causing droplets to escape. A damaged cap is also an issue—poor sealing allows steam to constantly escape, leading to rapid water level drops. Internal leaks, like a blown head gasket allowing coolant into the combustion chamber (burning it off), are more dangerous—this causes white exhaust smoke and sudden engine overheating. Additionally, a worn water pump seal or low-quality coolant with a low boiling point (accelerating evaporation) can worsen the issue. During regular checks, I first feel hoses for dampness, then use a mirror to inspect hidden leak points. If the level drops sharply after refilling and a short drive, immediate repair is needed to avoid costly engine overheating damage. Making a habit of monthly coolant level checks is crucial.
