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Automotive Cooling System: Radiator Flush-What is a Radiator Flush?

In this article on cooling systems I will try to answer the question, “What is a Radiator Flush?”



Astro Pneumatic (AST78585) Radiator Pressure Tester and Vacuum Type Cooling Kit with 78581 Adapter
Cooling Pressure Test Kit

Basically a radiator flush is what it sounds like, the flushing and cleaning of your radiator. At least once a year you should have your cooling system inspected for proper operation. The job of the radiator is to help cool down the automotive engine in extreme cold and hot weather. Should your radiator get dirty and plugged up you will notice a rise in your temperature gage. This is where a radiator flush might be suggested by your local auto repair technician.


Ready-Rad 0433741 New Radiator
Automotive Radiator

The cost of a radiator flush should run you around $20-$30 and should take about 30 minutes to perform. The automotive repair technician will wait a few minutes before removing your radiator cap and opening your radiator drain plug. Once this is completed most of your antifreeze just in the radiator will be drained out and possibly recycled. Some auto repair shops will run some water through the radiator for cleaning purposes before the new antifreeze is poured back in.


Dart 31122221 Iron Eagle 9.325" / 4.125" / 400 Small Engine Block for Chevy
Car Engine Block

The contaminants that will be removed by the radiator flush is dirt, rust, and corrosion. If your cooling system is not flushed out on a regular basis the radiator could eventually plug up and cause your engine to overheat. The worst case scenario is you will blow a head gasket causing hundreds of dollars in auto repairs. So as you can see it’s a good idea to have your radiator flush on your cooling system at least once a year.

Back in the 90's I can remember the big problem with General Motor's orange life time antifreeze. It was suppose to last the life of the car then they said ok maybe it will last 100,000 miles instead. I can remember doing some warranty work at a Buick Dealership and found cars and trucks with only 30-40 thousand miles on them and the orange antifreeze was eating away the engine from the inside out! Gaskets were giving out earlier than what was expected, the entire cooling system was deterioating very quickly. General Motors finally warned the consumers to get rid of the orange antifreeze with a cooling system flush and fill including flushing out the radiator. You can find some of the information here.  

My 25 years experience found that an entire flush and fill on every make and model should be performed once a year with a thermostat and radiator cap. This type of maintenance on your automotive cooling system will prevent any cooling system problem for the life of the car.

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