Help me identify these sensors/switch... Quad4

[DanteGTZ]

I always forget which of these is the temperature switch and which is the temperature sender. I replaced both of these before my new engine went in. For some reason, my cooling fan isn't coming on - It does switch on when a scanner is plugged in, so I know the fan works, but...

Both of these are used on my 93 Quad4 and are threaded into my thermostat housing.

Anyway, the pic is attached.

Thanks!

[Cliff8928]

Neither one of them directly controls the fan. The one with the oval 2-pin plug is the one for the ECM which turns the fan on.