Two Loops, One radiator

[nikhsub1]

...If the water just blasts through the rad the air doesnt have as much time to absorb the heat, if the water sits in the rad too long the air will absorb all the heat but the rest of the water will get hotter meaning the rad now has to remove more heat.

This could not be more incorrect. Please do some reading before blasting 'fantasy physics' on a public forum.

As far as scientific data your on your own but just given the general nature of how a radiator works water passes through it and as it passes through it air blowing through the radiator absorbs the heat. So the faster the water moves through the radiator the less time their is for the air to dissapate that heat.

When everything is on one loop you have to find a happy medium within which the water moving through the blocks has doesn't have enough time to overheat and the water moving through the radiator has enough time to dissipate the heat.

So then you're just making all this up? This has been discussed to death for many years. I wish I knew how this false myth keeps getting perpetuated.