6 volt radiator fan recommendation

[Old Henry]

I recently bought a radiator fan from Speedway and it didn't help my overheating problem one degree so sent it back for a refund. I mounted it in front of the radiator to blow through it. Although I detected a slight vacuum in front of the fan when it was running. I could hardly feel any air coming through the radiator.

My radiator is a brand new aftermarket radiator that I've already concluded is not as good as my old original that was totaled when I hit a deer a year ago. I'm just trying to get it to work better without having to replace it with a used original.

What is the best, most powerful 6 volt fan to use?

Thanks in advance for your recommendations