CORRECT OPERATION

Hot coolant from the engine enters the radiator and flows through the core. The core is composed of numerous small tubes, usually copper or aluminum (both good heat conductors). The heat is transferred from the liquid to the tubes and their aluminum cooling fins. These fins are cooled by air passing through the radiator. The cooled liquid then returns to the engine to absorb more heat.

If corrosion is noticed inside the radiator, the cooling system has a leak and must be repaired. Low coolant level in the radiator, loose hose connections, a faulty radiator cap, a leaking recovery reservoir connection, or a leaking water pump all would permit air to be pulled into the system. Alternatively, an exhaust gas leak into the cooling system through the cylinder head gasket, cylinder head, or engine block will cause corrosion too.

SYSTEMS
RADIATOR
PROPER CARE
VARIATIONS