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Rust in the Cooling System

An engine has rust in the antifreeze. The antifreeze looks very brown, and water pump bearing keeps going out. There is not an overflow tank (reservoir tank) on this vehicle or it has been remove or damage. What could be the problem.

 Solution:
Rust in the cooling system and antifreeze is normally cause by air getting into the radiator when the engine cools. As the coolant cools, it shrinks. An overflow tank normally ha sufficient coolant in it to keep the radiator full even at cold temperatures. Without an overflow tank or damage tank, air will be enter the cooling system through the radiator cap. The rust in the coolant also causes wear on the water pump seal and the bearing. The best solution is to purchase an overflow tank and install it on the cooling system, after the cooling system as been service. Keep the overflow tank filled to the mark shown on the tank.
  
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