[g.l.amour]

in parallel it should work better... but only marginally. i did the test with 2 rads parallel or serial, and with the temp measurement equipment i had at that time, i couldn't spot any difference.

a serial setup is easier to bleed (requires a less powerfull pump), because the flow isn't cut in half at the point the tubes divide in 2.

so really, if i were to do it all again, i would have left it serial. instead of having bought a 100$ pump + all the hassle of rerouting (i am offcourse forgetting the fun i had doing it all).

hope this helps...