I need a new fan switch and didn't know which would be the best to use, the one that comes on @176,off @166 or the one that comes on @200,off 185.

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1991 Z28 5.7L
All free mods/afpr/hurst lock up harness/flowmasters(off)/lakewood Lca's/accel stock size injectors/msd6A-plugs, ignition coil/k&n/lakewood adjustable panhard rod.
1/4mile 13.7@102. Expected et next outing 12.9@? (with slp 1 3/4 headers and new ported sportsman II heads along with 24lb injectors, adjustable torque arm spohn or bmr)

 

Get the one that matches your thermostat temp rating. If you have a 160* stat, then get the first switch (176/166); if you have a 180* stat, then get the second switch.

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Greg Westphal
'87 IROC 355TPI/A4