Can someone tell me what the 4 pin sensor located between the distributor and the air horn is, what it does, and how I can test it.

I have a good photo of it but was not able to load it with this question so I could use some help learning how to load a photo also...

With the engine cold, the CCU blower fan starts after ten seconds when dial setting is calling for additional heat, but literature I have read says there is an "engine kill switch" (single pole) that should keep the fan from starting until the engine reaches 35 deg C.

Does my car have this switch and where would it be?
I dont really need more heat right now, just thought I ought to get this fixed before winter...

Thanks, CR