My instinct leads me to believe a puller will move more air through a
radiator than a pusher.
However, the improvement in airflow with an electric fan, particularly
when a car is at a standstill - whether you push or pull - is, in my view,
plenty to keep a healthy car cool.
If you want the fan out of sight, set it up as a pusher.
Matt at Triumph Rescue told me that he can set running a number of cars
with standard fans on a hot day (he was talking about TR3s at the time)
that all appear identical. Some will overheat, some won't, and that's the
way they are.
Maybe my experience could explain some of the variances? I removed the
block's seized, brass, coolant valve on my 62 TR4 to replace it with a new
working valve last year. With the car full of coolant, and the valve
removed from the open threaded hole in the engine block, no coolant came
out.
Puzzled, and unable to see inside, I poked around with the thin red straw
from an aerosol lube. Slowly a trickle began, then sand started coming
out, then globs of sand started coming out. Green, sparkly sand. At least
an egg cup-full, maybe more. This was, I'm guessing, casting sand from the
block's birth.
Lot's of back flushing later, and I had an open gallery inside the block
that led from the valve's placement. My car, which never overheated even
on a hot day, began to run, and runs still, two needle widths to the
cooler side on the temp display, just left of centre in the 'normal range'
on the gauge.
If your car tends to the warm side, and if you have such a valve in your
block, open it (or remove it as I had to) to see if coolant runs out
freely. If not, maybe you have some green, sparkly sand of your own.
Even if your gauge doesn't show a return, it has to help, surely.
Brian Jones
TR4 1962(3)
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