Coolant pump, thermoswitch

[Danny]

Whats up all. Decided to finally try to figure out why my after run fan doesnt come on.  the bentley says to disconnect the thermoswitch wires and attach em together. I havent really gone crazy at it, but my question is, how the hell do you reach it? From underneath? Anyone btdt? Also what does the switch attached to the coolant pump do? the bentley doesnt show it, although im probably lookin at the wrong page. tia
Danny