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Old 07-18-2021, 01:01 PM
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manual override is the ultimate safety for a failed T-switch

Quote:
Originally Posted by bcredliner View Post
Is this install procedure to do more than make sure the battery doesn't run down? Why do you need an on/off/auto switch?
Like on your installation, the thermostatic switch is the ideal "automatic" control; it is supposed to turn the fan on-off as determined by coolant temperature, and the switched power for that T-switch will limit it's run-time after engine shutdown to 16 minutes. Ideally. The manual override is to make sure there is a way to power up the fan, if the T-switch fails (your switches have failed before, as have some of mine).

My "switched" power isn't that...I'll need another, true, switched power circuit. And, since my T-switch is set too high (preset) to trigger the fan relay, I just bought an adjustable (32F-248F) fan controller to be able to trigger the relay on-off automatically, as initially planned. I'll put the sensor in the hottest location the probe will fit into (even if it must go into the cool-ish spot I had previously inserted the other T-switch probe into). Then I'll turn the rheostat down until the coolant reaches 175-180F (as shown on my Torque Pro app monitor), and turns on the fan.

I bought the Hayden 3653 adjustable fan controller on a side-trip while shopping for pet supplies (dogs, feral cats, chickens), and getting breakfast at a new-to-us spot. I popped into an O'Reilly's and bought one I'd used before. Can't hurt to try it, for $20.
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