Well, after two weeks with the new system, I went back to the old one. Here's why:
No matter what I did, there was a massive delay from turning on the fan to dropping temperature. Another problem was that the system wasn't pressurised properly. Firstly not at all, so I blocked the overflow. Still made me very nervous. In the meantime Dad removed the top of the car's original radiator (with heat) and checked the flow through the core. Quite a few of the passages were blocked with "rust and shit" (don't blame me, I'm just quoting). He cleared these and soldered the top on again. I decided to play it safe and:
1. Keep the a/c fan
2. Keep the six bladed fan I was using before the electric experimentation
3. Use the long fan spacer
The radiator leaked, probably through one of the formerly blocked passages. Stop leak fixed this up and even on a hot day the temperature barely gets to half way.
Moral is: Restore the car, don't try and update.
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