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My outside temp and engine heat gauges work fine. Not too handy with cars, can't for the life of me figure out this wires function.

 

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That's the "Fan Switch C" exclusive to the TL-S it makes the fans turn on under different circumstances compared to the TL-p...

 

Thank you so much, I've been looking at radiator diagrams thinking I was crazy! What part would I need to order to replace? Looks like the clip it connects to may have busted when I tore my bumper off on a high curb.

 

I found the part - http://www.ebay.com/itm/Engine-Coolant-Fan-Temperature-Switch-Standard-fits-01-03-Acura-CL-3-2L-V6-/281673925014?fits=Year%3A2003%7CMake%3AAcura%7CModel%3ATL&hash=item4195130196&vxp=mtr


Would I have to drain the coolant before replacing this fan switch?

 

Your A/F will definitely drain like super fast if you remove that plug, so yup you will need to drain before you unplug it.