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This problem has been buggin me for a while now. I don't get it, my radiator always overflows and the engine never gets hot. It seems no matter how long you let it cool when you open the rad cap it releases a ton of pressure along with a ton of antifreeze (not even hot).
13 psi cap, overflow level with top of rad, modine alluminum rad tested by a local shop before use.

13 psi cap, overflow level with top of rad, modine alluminum rad tested by a local shop before use.