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What are the advantages of an aluminum radiator?

I know you'd have to use DexCool, but what is the advantage...di ssipates heat faster, lightweight?

I've looked around a little, and came up with the following:
aluminium radiators conduct heat better than copper radiators, but copper radiators are repairable (as aluminium have to be replaced when they have a crack). Also the aluminium ones are more expensive...

my car's overheating real bad lately, been in the vette for over a week now - if I drive at speed, the car runs cool - if I'm sitting at a light, it gets pretty hot.  I'm buying the fan clutch, fan and replacing the water pump on saturday, and I sure hope this fixes it.

Jeff

Our cars have a temp sensor located on the upper side of the radiator (washer fluid side).  It has 3 prons.  It makes the a/c fan come alive at certain temperature (fan runs slow) and when the car is really hot, kicks in again an then the a/c fan goes to max speed.

Most of the time this temp sensor goes bad along with the resistor that is attached to the electric fan.  One more thing,,,,replace your thermostat or just don't install it.  My car has no issues and it has been without it for the last 5 yeas.

Good luck

I will install the temp sensor first, and I sure hope this fixes it.

Common signs of a blown head gasket - anybody have that info?  I don't think that's it, but I would like to eliminate that as a problem.