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I heard stock radiators on a '94 model camry ought to be aluminium, but on scratching the paint off the radiator core fins, I find a copper color instead of a silvery aluminium color. Could it be that I have an aftermarket copper radiator fitted by my previous owner? If so will I require the OAT type coolant/Toyota red coolant or am I better off using a good quality green type coolant after a full flush down of my cooling system?
 

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Is the top and bottom of the radiator plastic? If so, this is usually a sign of an OEM type radiator with aluminum core. The article below explains coolants, what to use with an aluminum or cooper radiator.

Suggest finding a coolant without silicates or borates. Toyota is free of these additives and the longer life coolants should also be. Just read the container to find out. Prestone has a long life fluid.

http://www.popularmechanics.com/how_to_central/automotive/1272436.html
 
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