Question about 2002 Jeep Grand Cherokee

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My 2002 jeep grand cherokee has a bad radiator fan relay but the new one i bought came with a new pigtail but the colors dont match up, the pigtail has black, red , blue and greenbut the wires i have to hook it up to are black, light green, gray, and dark green, can someone please help?

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  • Contributor
  • 61 Answers

Get the same one you had previously for $5 at a local junk yard.

Posted on Nov 19, 2014

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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chryslertech
  • 115 Answers

SOURCE: wher is fan sensor and fuse for radiator cooling fan 2002 jeep ch

Yes your fan relay has failed . Pull you right front headlight assem out . Look threw the holes in the plastic that the light assem set in, it is underneath the plastic screwed to the body. You can pull the grill assem off to get to it or you can cut a 2 by 2 inch hole where the channel is in the plastic where the headlight goes. Citting a hole there wont cause any problems. If you cut a hole , cut it at about the center of the channel at the half way point from the front to the back. This is a solid state relay so it looks different then your typical relay.

Posted on Mar 28, 2009

  • 11 Answers

SOURCE: radiator fan not working replaced relay,temp

Check the wiring from the relay to the fan motor, and check the wiring from the fuse block. Basically check all wires that supply power to the fan motor, use a volt meter. Fan Relay (behind headlight, under battery) on the 2001 GC 4.0L are a piece of ****, I change mine almost yearly. The problem is their location, a high heat area prone to the elements. I understand that 2002 and newer, the location was changed and the problem solved. Relay might close the circuit when cold or at reasonable temps, but might open a circuit when it heats up, causing the problem.

Posted on Apr 03, 2009

joecoolvette
  • 5660 Answers

SOURCE: cant find IAT on 99 jeep grand cherokee laredo...

Intake Air Temperature sensor.

It has to be installed ->BEFORE the throttle body, to sense the density of the air entering the intake manifold, based upon intake manifold temperature.

It provides an input voltage to the PCM, (Powertrain Control Module)
It's a Negative Thermal Coefficient sensor, (NTC. It uses two wires)

Meaning, as intake manifold temperature Increases, resistance in the sensor increases.
(Less voltage)
As the temperature Decreases, resistance in the sensor Decreases. (More voltage)

The PCM then uses this input to calculate the following;
1.Injector-Pulse Width
2.Adjustment of spark timing.

Just thought you might want to know.

Wish I knew what size your engine is.
A. The IAT in the 3.7 Liter engine, is located in the Left side, {Drivers} of Intake Manifold Plenum. (BEFORE the throttle body)

See that plastic 'snorkel' tube, that comes from the air cleaner housing, and goes to an oval shaped aluminum housing? That oval shaped, {On the end}, housing is the Intake Manifold Plenum.

The 4.7 Liter engine has the IAT in the same place.
The 4.0 Liter has the IAT installed INSIDE, the Front of the Intake Manifold Plenum. (Before the throttle body)

The color of the two wires are Brown with a Yellow stripe, (Thick 20 gauge wire), and Black with a Red stripe. (Thinner wire. 18 gauge)




Posted on Aug 07, 2009

motor1258
  • 6674 Answers

SOURCE: where is the radiator fan relay switch on a 2002

check under hood in fuse relay box. Map should be underside of cover.

Posted on Aug 27, 2009

ZJLimited
  • 17970 Answers

SOURCE: 2002 jeep grand cherokee replaced radiator cooling

The airbag light will come on and stay on as long as there is an active code in the system, this means that something is malfunctioning right now so we will turn the light on. You really need to have the codes checked for an accurate diagnosis.

Its possible that you have some problem or your sensor go to bad...

1. Disconnect and isolate the battery negative cable. Wait two minutes for the system capacitor to discharge before further service.
2. From the engine compartment, disconnect the right or left headlamp and dash wire harness connector for the front impact sensor from the sensor connector receptacle
3. From the engine compartment, remove the two screws that secure the right or left front impact sensor to the sensor mounting bracket on the right or left radiator support vertical member.
4. Remove the front impact sensor from the sensor mounting bracket.

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That is for replacement, you just reverse the list for install.

Hope helps.

Posted on Feb 25, 2011

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