Question about Jeep Cherokee

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Cant get my jeep to shift out of third to overdrive sometimes when is stuck ind third the cooler fans run really fast and loud and revs the motor up

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  • John Lee Fisher Dec 07, 2016

    Thanks for the help your answer was very helpful but I hit the wrong button and couldn't clear the not helpful again thank you for your comment

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  • Jeep Master
  • 20,706 Answers

Redux 3.
no car stated, then adds, 2005 WK jeep
no engine options (size) stated. 3.7L or 4.7L???
you posted symptoms.
all 3 are clear facts,

and all 3 are normal when any
ENGINE or TCM brain (trans brain)
sees overheating!!! a fact.
be that real or fibbing ECT. (coolant temp)
or fibbing trans temperature sensor.
omg both ....(omg means oh my gosh)

tells me what is the chance of both fibbing?
not much. really.... (odds...)
tells me, (my hands are tied)
that you didnt scan it!
nor see that both sensors are too hot.
and is REAL.
my best guess.

TCM= transmission control module
PCM = power train control module, and may have TCM onboard.

sorry for ASE jargon, ASE invented this.
uSA invented OBD2, by law.
we have no lack of information in this regard,
not in the least.


there are 25 or more overheating symtoms.
bests your 3 stated.
1: the dash meter shows it is.
2: the engine power drops
3: CEL glows, check engine light glows. worse flashes.
4: engine pings.
5: engine brain goes to limphome (google that)
6: Transmission brain, does same.
(and a list of symtoms here, shifts wrong, tops list).
7: leaks
8: steam.
9: gurgling sounds from heater, core.
10: coolant blasting violantly from the side RAD expansion tank lid,
11:Rad cap leaks. or its side hose blasts off.
12: rad leaks.
13, heater hoses leak or core leaks or any hose,
14: Radiator was not full when you started the engine, oops.
and more, lots more, fans blast, engine races.
15: running a thermostat for 10 year's years is a FAIL.

Posted on Dec 07, 2016

  • 4 more comments 
  • John Lee Fisher Dec 07, 2016

    Thank-you, it's the engine cooling fan

  • _-__-___-_
    _-__-___-_ Dec 08, 2016

    the fan. run fast, that mean the PCM sees the ECT sensor is reading wrong. (hot)
    i read your other posts why not just add comments to one,?
    2005 cherokee. (a Liberty ,rebadged for Europe?)
    we dont have your car in uSA, not one.here.
    so your car is not here, so our books are no good for your non usa car.

    that being said, if you'd post all symptoms
    no country stated
    no engine size stated (cylinder count and displacements.
    no fuel , petrol or diesel stated.?
    only that its 4wd and autotrans
    does car drive ok, day or night.(discounting shifting odd)
    ?????????????????????
    all electrics work ok beside the RAD FAN.
    can I assume its the rear rad fan acting odd
    and not the fan in front of rad, called the condensor fan?
    all this tells the helper most facts
    we cant drive it so....
    The saga 1:
    check all fuses yet.?
    check all fuild levels yet?
    why not scan the pcm now and get those errors you are not seeing, all cars, we must do that or look like a dog chasing our tails.
    fun for only me to watch (grinnnnnnnnn)
    is engine heat on dash showing odd temp readings?> low,high or worse wagging up and down?

    let engine cool,
    then take off the rad cap.
    the lets you see real coolant levels.
    are you running 50% antifreeze? (a tool or $2 checks this)
    if the level is wrong, that means it leaked out
    or the engine overheated, are others driving your car?

    our KJ 05 runs 2.4l engine and 3.7L both gas.
    is yours like that? gas (petrol)
    or 3.7L has a 2 speed fan.
    (software runs it, and runs fast for too hot engine or if A/C is on)
    are you running A/C? or heat+ defrost?

    know this, if the coolant drops
    the ECT (engine heat sensor) goes nuts
    and the fans will act odd, due to the ECT
    reading wrong, or even the truth.
    its that simple
    you are ignoring the dash heat gauge?
    or not checking true rad levels cold.
    and are not scanning the pcm
    you'd see DTC errors and the ECT acting odd
    then you check levels and find the
    rad not full!! as it must be.
    if it drops low the ECt then gets air pocket around it. and reads WRONG.
    actually it reans crazy as water splshes like crazy there.

    learn how to measure true rad
    levels
    and true temperatures, and the rest is easy.

  • Anonymous Dec 08, 2016

    engine overheated.
    did or does.
    my guess, this is your first car that ever did., ??? what a charmed life if true.
    All cars do , sooner or later... if you drive them for 15 years. one will.
    Ive driven some 250k miles each.

  • John Lee Fisher Dec 09, 2016

    wow i hope all those comments were not aimed at my question because if they were our wires got crossed somewhere i have a 2005 Jeep Grand Cherokee im here for help because im not a mechanic so im not sure what all these abreveations mean. sounds like i may have even upset a few of you with my mechanical ignorance thanks anyway. p.s. l i b m r ducks

  • Anonymous Dec 28, 2016

    John,
    you posted a grand to a non grand Cherokee forum why? with no year, above.
    asking for mechanical (and electronics)
    and not t expecting ASE jargon on same?
    nor real answers?
    why not say, i only want guessing, we can do that. (your thermostat is bad,) end guess.

    ok ill type them out for you,... it's a pain but here goes.
    YOu have a modern car,! a 2005 WK
    I own a 2010, its 3.7L and same, with full documentation on it to the extreme.

    1: did you scan the car at PCM with an obd2 scan tool, is car in USA. if not say so.
    English, the power train control module(PCM) needs to be scanned, all usa scan tools work on all uSA cars, 1996 and newer, it's called, OBD2.
    wiki OBD2, and learn. I cant teach you scans.
    in less than 10,00o words.

    2: the fans, run fast the brain(pcm) thinks true or not, that the engine is too hot.

    "self preservation logic in the Brain)
    Allen Turning brain, references..... credits.

    3: the engine racing, sure, same as #2
    the engine may try to speed up the water pump
    and cool the engine down some,. (software)
    self preservation is part of all newer cars.

    seems to me you dont do basic service>?
    checking levels correctly.? ask.

    4: the ECT sensor tells the brain the coolant temperature as all times. and is super important. but if the coolant level is TOO low
    the ECT lies. "engine coolant temp" sensor.
    ECT btw is the name coined by the SAE.http://www.sae.org/
    The ASE named all major EFI parts long ago.
    so we do not have to type out.
    engine coolant temp
    a 100 time, endlessly... see>?
    all technology has jargon, if you dont learn it you will get lost fast. for sure.
    the ECT can go crazy with air below it.
    hot,cold,hot,cold over and over.
    so the BRAIN can see that and go nuts too.
    (computer logic 101)
    it can not measure air, at all temp.(temp=temperature)
    not at all, so lies, to the PCM brain
    the brain in every case of this, will do the wrong thing or some odd thing,
    whats the point, none, all computers do that
    on earth , GIGO, garbage in nets you garbage out. all brains do. (even humans)

    if the ECT did not lie and water was 250F then the ENGINE IS TOO HOT!!!< and you failed\
    to notice that... if true.?

    what you failed to do , best guess,
    1: failed to check actual rad levels on a dead cold engine.. not that silly side tank, opaque. (expansion tanks fail or lie)
    the actual Radiator levels. matters 100%

    2: scan it. you didnt scan it .

    3: or skip all the above and get car serviced, like 99% do.

    there more
    the engine too hot sthe engine brain
    to go to special modes and some times
    limphome mode. (google limphome mode)

    the transmission does the same.
    if the trans sees over temps
    it blocks TCC lockup or even overdrive.
    this cools the automatic transmission fluid. ATF
    this is all just facts, just normal actions
    all cars do (modern)
    the brain is smart enough to protect its self from bad drivers now.
    over heated engines, ignored,
    tell; me,
    with a computer now, why burn up and engine or $4000 transmission, with low engine coolant.

    my Chevy even cuts dead cylinders to lower engine temp.s
    as you can see it is no 1941 willis jeep now.

    so all we know now is what.
    2005 wK with some unstated engine.
    both PCM and TCM brains seen engine overheated
    but not you.?

  • Anonymous Dec 28, 2016

    short answer, in the spirit of fixya
    wild guessing,
    the engine thermostat is bad,
    like all do 10 years old.

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  • Contributor
  • 6 Answers

What model I have a 2000 an it does not have overdrive its going bad but depending on your speed your rpms will be higher with means more strain on the motor witch will cause it to run hotter then normal witch can cause your transmission to get hot and slip

Posted on Dec 07, 2016

  • _-__-___-_
    _-__-___-_ Dec 28, 2016

    his is in limphome mode.
    a 5 year newer box, in his, quite different;

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wow no engine size stated, the 5.2L run a special trans... so....
hopeless to help you much.
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it didnt lie, it told you to service it, so take it to a shop and let the work on this old dog..
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