Computer control may not be working have it checked with scan tool actavate the fan relay if it dont work either controller or wires
SOURCE: finding the relay for electric fan on '89 jeep cherokee laredo 4.0
It is on the driver fender near air filter housing. Also next to the fuel pump ballast resistor. It is the white 3 inch long piece of ceramic on the fender with eletricial connectors on each end.
SOURCE: i got a 99 jeep
It's behind the passenger headlight.Need to take off grill,bumper fascia to get access to it.Mine took about an hour alltogether.
SOURCE: 1999 jeep grand cherokee laredo 4.0 litre
OK here we go you will need a test light for the following tests, i will try to be as descriptive as possible so lets get started
fist start the engine and turn on the a/c that should command the fan on.
right front engine compartment next to the battery is the power distribution center pop off the top, ground your test light to the negative battery terminal and find fuse number 10 it is a 40 amp fuse check both sides of this fuse with your test light, if you have power on both sides of the fuse than we shall go further.
unplug the connector from the cooling fan, there should be two wires in the plug one is dark green and the other is black with a pink tracer, with your test lite grounded to the negative battery terminal check the dark green wire for power, if there is power there than move your test light ground clamp to the battery positive terminal and test the black wire for ground,
if testing the black wire made the test light shine than the ground circuit is good, if it did not than check you ground connection behind the right headlight.
when testing the dark green wire, if the dark green wire made the test light shine and the ground circuit is good than you simply have a bad coolant fan motor.
I suspect you were not getting power to the fan motor so you will need to take a look at the radiator fan relay, this is a special solid state relay mounted to the inside of radiator core support on the right side down behind the bumper.
here you will find a single plug with 4 wires in it
black = ground
dark blue / pink = relay controll from pcm
dark green = output to radiator cooling fan
gray = battery power from fuse # 10 in pdc
unplug the relay ground your test light to the battery negative terminal, with the engine running and a/c turned on check the gray wire the test light, it should turn on if not recheck fuses.
move your test light to the battery posistive terminal and test the dark blue / pink wire, if the test light turns on than you have a bad radiator fan relay, you can pick one up at your local parts store for about $85.00 just make sure you get a high quality one the cheap ones have a hard time with the amprege consumption of that fan.
good luck
wesley [email protected]
SOURCE: How to replace cv boots front end of 1999 jeep
dont replace the boots the cv is junk relace the shafts the shafts rebuilt are 59 or 69 $
Testimonial: "Thanks very much.With the economy we can only afford what is neccesary."
SOURCE: 1998 Jeep Grand Cherokee Laredo 4.oL I got a code po113
Trouble Code: P0113 (4.0L L6 VIN S Auto)
IAT Sensor Circuit High Input
Print this code data
Number of Trips to Set Code: 1
OBD II Monitor Type: CCM Details
Indicators: MIL Details
Trouble Code Conditions:
Check with ignition on or engine running; battery voltage more than 10v; The PCM detected the IAT Sensor input was over 4.90v (exc. Dakota, Durango, Ram) or 4.98v (Dakota, Durango, Ram) for 3 seconds.
Possible Causes:
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