I use a 180 degree stat, but the engine pretty much always runs at 194. I have mine set to turn on at 197 and turn off at 195. I've found that setup for me works well with keeping the fan off at cruising speed where it's not needed.
With a 195 thermostat I'd like to turn the fans on around 203 and turn them off around 196 or 197. But every car will behave differently and there will be a bit of trial and error that you'll need to do to find what your car likes.
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-Jason
1969 Pontiac Firebird
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