I will try to make a little brass fitting for the barb I have. Thats a good idea if I can get it to stick. Im thinking I should have bought barbs with threads on them. this is not a problem though they were cheep and i can use them anywere in the loop.
Your right about the old car rad. I think I could just get my pops to grab me a new one from his wholesale supplyer...dont most car repair shops have those? lol
See if he can get a 1975 Pontiac Bonnivlle with out AC heater core, if he can get one with 5/8" barbs jump on it, you can stretch 1/2" ID tubing over those with a little bit of cussing.....Really any core close to 10"x5" and a couple of inches thick will work...That way it will fit 2-120x38mm fans on it...A 1986 Chevette core isn't bad either, its just a single 120 size though...
Here is a old list of cores and sizes....Find The Perfect Heatercore