Home made fan shroud.

You see that second bypass? The one that used to go to the heater.
What's it doing?
It's sending hot water back into the pump for a second go-round............
I plugged mine.

And what about that hose-splicer?
Did you do that to the bottom one too?

IMO, you're going from bad to worse.Put a monitor on that circuit; see if it ever shuts off.
It costs a lot of gas-money to run that thing full-time, what with the electrical conversion factor. How many amps does that thing pull? Would it be 20? 20Amps at 13.2 volts is 264 watts, or about a third of an electrical horsepower. But the alternator is only what? 20% efficient, so it's gonna suck at least 5 times that out of the crank, so 1.75 horsepower..... full time? Ouch.
But maybe it only draws 10 amps and maybe the alternator is only 10%efficient. Well then it comes to the same thing.Except now the alternator is converting 90% of it's output into heat..... underhood heat...... cooking your fuel line. What's gonna happen when the underhood air temp becomes the same, or higher, than the temp of the air coming through the fan?

That's like running small lawn mower under there at 50% power. You better carry a spare alternator in your roadside repair kit.

I know u get "out there" on some of ur surmising , but u have outdone urself this time !! LOL