Fan senor switch for a 1997 jeep location

Good question...
Fan, which fan?
1: heater fan (blower)
2: front A/C condensor fan
3: engine coolant fan. ????????????????????
i must guess engine option, so will guess, 4.0L I-6
why do you ask, i can tell what problem you have ,unless a symptoms is stated, is engine overheating?
the 2.5L and 4.0L have electric fans with the A/C option
and run by different rules,
with no A/C option the 4L uses a clutch fan.
chapter 7, page 8, FSM.
.http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

did you use a scan tool to see if the ECU, detects electric fan issues.
it does do that. page 19. and the 2 fuses? same page, same chapter.
the same chapter reveal the trip on , temperatures.

now for a jump to how it works page.
chapter 8w , wiring,
page 20 index.
8w-42 fan motor relay.
42-9 or PDF page 213
the answer is there. the fan is totally operatered
by the PCM, or ECU.
the ECU closes the relay to the fan
any time the ECT shows too hot.
the ECT is a PRIME sensor to run EFI, knows coolant temps at all time. so there is (was) a need for and switch or fan thermost
the PCM know the temp and closes the relay on demand.
the PCM has trip table,. the fan activate rule.

so if hot wiring the fan fails, the fan is bad
if the 4 voltage to the fan relay are good the relay is bad
if the fuse are blown the relay will no get voltage power.
if the PCM fails to ground the coil on the relay that means
the PCM thinks the engine is cold, is it?
if the coolant is cold then the the termostat is stuck open.

see how symptoms , prove what is going on,
is engine overheating, ?

wiring 8w
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

if the engine is overheating,
we test the fan, if dead.
the fan comes on

the fan comes on by 4 rules, the A/C on or not.
ill answer for a/c off, lazy
fan comes on at 218F
fan trips off at 199F
the coolant thermostat is 195F.
so the test for the fan is to idle until the coolant hits 218F
and note the fan coming on,
that is the test, if it fails in any way we diagnose it with a simple voltmeter
how is that for an answer.
if you have sympotms , do post them so we can work the real problems.