Gas or Diesel?
check fuses first! then scan it, the PCM will set DTC errors
if power feeds to the fan are dead, not scanning cars first is a travesty to (labor, time, parts wasted etc) even $10 scan tool works on our USA cars this year.
first off there are 2 systems.
and you never said what engine.
no engine, we must guess.
why work on any car, not knowing whats under the hood.
??????
cylinder count 6,
displacement. 4.0 (wild guessing )
at the least. the big engine has the Hydr. system only.
wj jeep
4.0L or 4.7L engine.
ill answer for 4L , 5million sold.
TEST 1 (fan) parked and ran and purposefully overheated
this is a SOP FSM test , to see if the fan trips at the correct temperature !
if the fan does not work, parked, and overheating there are only these things wrong. ( any volt meter finds this easy)
1: ECT not showing overheat, to PCM ( use a scan tool !!!)
2: PCM cant see ECT , wires bad to ECT. sensor.
3: PCM fails to close relay (volt meter checked) due to above.
4: relay bad, or missing or wires to it bad. coil must be 12vdc hot.
5: relay output at 12vdc but fan dead, that is a dead fan, (hot)
in all cases bad wires and fuses and connections bad.
the 4.0L engine fan is a hybrid, has electric fan and thermal fan on front of water pump. so there are 2 tests.
WJ
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service
its all there.
cav 13/14 PDC socket is it.
open hood, open lid, see lid words, its there. fan.