Where is Coolant Temp Sensor?

On a 1991 305 tpi z28. I found a sensor in the front of the engine, actually going into my intake manifold. Everyone says its on the head, so where on the head? Passenger side doesn't help as I'm not seeing it, thanks.

which one aer you talking about? you have three....

its on the passenger side of the block near the back.. thats the fan switch

you hafta get to it from underneath.

just finished it, fans work now, but it was a pain. thanks.