Procedure For Flushing

The flush process usually takes about 3 hours, including time to allow the hot engine to cool first.
We start by opening the drain on the radiator or disconnecting the lower hose to drain the radiator.  This removes about half of the coolant in the system.  A heater, bypass, or vent hose is used to flush through the engine, heater core, and radiator to remove all old coolant and loose sediment.  The system is refilled with fresh coolant and the cooling system vent bleeds are opened to completely fill the system and remove all trapped air.  Flushing is usually done with water only;  there are many “radiator flush” additives on the market, but there are very few cooling system problems that can be solved by the contents of a can.

Flushing is a Preventative Maintenance Procedure

 Flushing the cooling system removes loose rust, dirt, and sediment from the cooling system.  Most radiators today are small, made of lightweight aluminum, and crammed so tightly in the front of the car you can barely see it. The inside of the radiator is made up of a honey comb maze of tubes that sends the hot antifreeze on a long meandering journey inside the radiator.  The majority of the rust, dirt and sediment will be trapped at the bottom of the radiator, and we will not be able to remove enough of this compacted material to make any real significant difference in the cooling ability of the system. A flush will, however, remove suspended sludge before it can settle and become compacted.  If the tubes of the radiator are plugged and causing the vehicle to run hot, flushing is not likely to solve the problem. 
Coolant is about 30% corrosion inhibitors and these are depleted with time and mileage.  Flushing and refilling with fresh coolant every two to three years WILL help maintain and extend the life of your vehicle, but probably will NOT cure an over-heating problem.



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