2004 Jeep Grand Cherokee Logo

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Jeremy Teakell Posted on Jan 23, 2017
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04 jeep grand cherokee. Blinkers, heater and ac, high and low cooling fans....all quit working at once. checked fuses and relays under hood, inside fuse box good, repaced ignition switch, checked

Wires i could see, goofed with wires and plugs, unhooked battery for 30 minutes.......oh yeah, airbag light came on too. any sugestions

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  • Jeep Master 20,706 Answers
  • Posted on Jan 24, 2017
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Joined: Apr 06, 2013
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Checked means what, gandering at them
checking real is measuring them, with an OHM meter
fuse that look bad are in fact bad, but look ok can in fact have hair line cracks humans cant see, for sure old folks.
what works and what not is the TOP CLUE here,
1:heater blower dead, blower key word
2: ac DEAD sure it is with #1 PCM logic does that.
3:blinker something , dead, stuck on, one works 3 dont what?
4: high low cooling fans, underhood or dash?
5: does car drive, omg, does it? and not stated !!!!!
6: does car drive at night, headlamps work.
7: air bag on , driving? when? it will just key on, as do all warnings as s self test.
8: anything else work or not work , radio, wipers, and all things.?
9: does engine crank ,ok fast, sounds strong?
10: are head lamps dim.????
11: did you skip things that are dead in your report.?

ID bet you never scanned it , right.

what does GOOFED mean.???? sounds scary that.,!means hacking to me.... why say this.? with no photos show if damage. you cant fix modern cars lacking a scan tool.
I can do magic with my tools but you cant.
i have a full lab. (lab scopes and things you've never seen)
but a scan tool is dirt cheap and is a MUST.
IF the cars power distribution system fails
even a $10 voltmeter can find this, got one?

lets see. the list
1: fuses good, not the gandered at way.
2: battery lugs ok, not corroded.

tell more, get more, lots more,

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Only overheating at idle while standing still is most probably a cooling fan problem. If you have the electrical cooling fan, then first check its fuse. If ok, than there are two separate relays (high speed and low speed) in the power distribution center under the hood. (this is for 2004 model only). Swap both relays, it can be that the low speed relay is bad. If this helped, than you will have to replace the bad relay. If this didn´t help, then put 12V directly on the fan motor (watch hands and loose clothing) to be sure the motor is not bad.
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After checking the conventional relays and fuses, we found an additional auxiliary cooling fan relay behind the front bumper. Once replaced, all is well.

The fan relay is likely shorted and keeping the fan motor energized; to check this you can remove the relays from the fuse panel... remove the cooling fan rely from the underhood PDC (Power Distribution Center). Fot this and additional fuse details, check this link: wjjeeps.com/fuses.htm

Hope helps.


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Hello, my son has a 1997 grand Cherokee and the heater quit working.So i started to go threw the fuses without touching any of them then it starts working again.And of course that lasted about a half a...

RELAY IS UNDER THE HOOD THEY ARE IN A FUSE BOX LIKE THING A BLACK PLASTIC BOX UNDER THE HOOD OPEN IT ITS ON ONE OF THE INER FENDERS MOST OF THE TIME AND THE RELAYS ARE MARKED ON THE LID OF THE BOX HORN FUEL PUMP HEATR FAN OK
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