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Old 03-03-2022, 06:26 PM
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I was concerned about running the battery down, if the thermal switch failed

Quote:
Originally Posted by bcredliner View Post
... Don't be concerned about running the battery down if the fan runs after the key is off to eliminate heat soak, it won't. As long as you have a variable controller you don't have to be concerned about the accuracy of a probe in the radiator fins since you can set it to come on where you want it to....
I had set mine up with thermal switch control (plus a manual override), which was only functioning with the ignition on. On a hot day, I wanted it to run a bit longer, unnattended, but didn't entirely trust the thermal switch to shut off the power before running the battery down. I've had thermal switches/controllers fail me a few times over the last 30+ years.

So, I bought and installed a BlackVue Power Magic Pro battery run-down protection device (meant for running dashcams for awhile after leaving the car) that I hooked up inline with my thermal switch/manual override/fan relay. https://xoutpost.com/1218266-post29.html

It looks like it'll do as I desired, but I may have to tweak the thermal switch settings, to let the fan run longer (it shuts off just before the BlackVue set-point). It seems to be what I wanted, for $27.

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