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I put a 16 inch fan on a thermostat on my 2.2 liter 544. At first I took the puny old style belt fan off - but the temp was a little erratic. It never overheated, but it would go up and down a lot. Of course, the cooling system is a little stressed in that car - it has a B16 radiator trying to keep a 2.2 liter B20 cool. And I probably wouldn't have noticed the temp wavering without a more accurate gauge. When I put the fan back on it made things a little calmer.
The electric fan still works perfectly to solve the two problems I originally put it on for - overheating in stop and go traffic on hot days and a little overboil when you drive it hard and shut it off.
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