1. Solder Bloom.
Solder corrosion caused by degradation of rust and leak inhibitors in antifreeze. Tube to header joints are weakened and corrosion can restrict coolant flow.
2. Tube-to-Header Leaks.
Failure of the solder joint results in coolant loss.
3. Leaky Oil Cooler.
Coolant shows traces of oil. Transmission or engine damage can result from the mixing of coolant with transmission fluid or engine oil.
Stray electrical current can cause excessive corrosion of metal components.
5. Internal Deposits.
Rust and leak inhibitors can form solids that collect in the cooling system and restrict flow.
6. Leaky Tank-to-Headers Seam.
Solder-joint-failure or cracked header is generally the result of pressure-cycle-fatigue.
7. Leaky Inlet/Outlet Fitting.
Leaks in this area can be caused by fatigue or solder-joint-corrosion.
Stray electrical current can cause an electrochemical reaction that will produce voids in tubes.
9. Fin Deterioration.
A chemical deterioration of the fins most often caused by road salt or sea water.
10. Blown Tank-to-Header Seam.
An indication that the radiator has been subjected to extreme pressures resulting from exhaust leaking into the cooling system.
11. Fan Damage.
A minor collision or a failed water pump can result in radiator damage.
12. Cracked Plastic Tanks.
High stress in the radiator can cause premature plastic-tank failure.
13. Fin Bond Failure.
A loss of solder bond between fins and tubes. Fins are loose in core causing loss of heat transfer and reducing radiator strength.
14. Loose Side Piece.
Can lead to flexing of the core and radiator tube failure.
15. Over Pressurization.
Excessive pressure in the radiator caused by a defective pressure cap or engine exhaust leak can destroy the radiator.
16. Steam Erosion.
Steam can break down the plastic tank which will produce thinning and ultimately holes in the plastic tank. Frequently, white deposits are also found.