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The fan I sent you has a metal heat sink. That is the type of fan that will fail.

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I guess I was mistaken then. I'll go ahead and get the alternator and do some testing here.


Now my only dilemma is on the temp sensor circuit. It looks like I can either detect a missing sensor, and fail-safe turn the fan on, OR, I can have the sensor grounded to turn the fan on.

If I just assUme the sensor isn't there, and it'll be grounded at some point, I would hate for an engine to overheat if the sensor got disconnected. Or, I just require a sensor, so grounding won't be an option

Or, grounding is an option, but you need to install a jumper or flip a switch, or some such thing.

Electronics design can be complicated