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Author Topic: overheating  (Read 2064 times)

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Offline giorno71

  • Baby Wheeler
  • Posts: 86
overheating
« on: July 30, 2009, 08:56:05 PM »
Just put a 4.0 l in my yj now it keeps overheating. do i have to upgrsde the rad. it's curently the stock from the 2.5. the water pump workes fine and i changed the thermostat.
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Offline Whips17

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Re: overheating
« Reply #1 on: July 30, 2009, 09:06:02 PM »
When I upgraded my motor I had to up grade my rad from a 2 core to a 4 core and it made a big diff,  also a electic fan will also make a big diff not only in cooling but thotle responce also.
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Offline giorno71

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Re: overheating
« Reply #2 on: July 30, 2009, 10:15:00 PM »
ya i have 2 eletric fans one pusher and one puller
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Offline JackstandJohnny

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Re: overheating
« Reply #3 on: July 30, 2009, 10:24:54 PM »
is the 4.0L good?  blown headgasket may cause that......
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Offline giorno71

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Re: overheating
« Reply #4 on: July 30, 2009, 10:34:42 PM »
Took it out of a 92 xj  took the xj from medicine hat to calgary and back and temp never went over 100 about a 3 hour drive each way, now i cant make it 5 min out of town and have to pull over and let it cool down
« Last Edit: July 30, 2009, 10:37:01 PM by giorno71 »
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Offline dunl

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Re: overheating
« Reply #5 on: July 30, 2009, 10:41:31 PM »
Air bubble?
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Offline giorno71

  • Baby Wheeler
  • Posts: 86
Re: overheating
« Reply #6 on: July 30, 2009, 10:44:27 PM »
Dont think so  flushed the system twice and new antifreeze. even changed the temp sender
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Offline JackstandJohnny

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Re: overheating
« Reply #7 on: July 30, 2009, 10:47:19 PM »
thats weird dude. mine is running a stock 2.5L rad and its nice and cool.  what size tires?  stock XJ, big YJ?  isn't running a pusher/puller setup counter productive?  (i am unsure of this)

maybe the rad is no good?
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~ rescue green JKUR on 35s.  typical rubicon build

Offline giorno71

  • Baby Wheeler
  • Posts: 86
Re: overheating
« Reply #8 on: July 30, 2009, 10:50:53 PM »
running 31X 10.50 tires and my 2.5 never had a problem with it and if i disconnect the pusher fan the temp goes up faster. i havent presure tested the rad but i tried the garden hose in the top port to see if i had lots of flow through it and it came out almost as fast as it went in
« Last Edit: July 30, 2009, 10:59:36 PM by giorno71 »
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Offline JENSSEN

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Re: overheating
« Reply #9 on: July 31, 2009, 08:17:00 AM »
Check your fuel pressure

Lean = HOT!
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Offline slimbeam

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Re: overheating
« Reply #10 on: July 31, 2009, 08:26:21 AM »
some water pumps are forward rotating  (2.5 + 4.2L with "V" drive belts) the 4.2L + 4.L and 2.5L with serpentine belt is reverse rotating.  you may  have the wrong pump for your setup
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Offline giorno71

  • Baby Wheeler
  • Posts: 86
Re: overheating
« Reply #11 on: August 01, 2009, 12:30:33 AM »
i have a infared temp gun to... but thanks . the water pump on the motor was on it when i did the swaped and it worked fine in the xj. changed the rad cap this evening will test it tommorow. also someone told me you can use clr to disolive corosion in the rad... has anyone tried this? seems kinda sketcy to me but the last thing i wanna do is buy a new rad and that not b the problem.
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Offline barmanjay

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Re: overheating
« Reply #12 on: August 01, 2009, 11:20:45 AM »
The t-stat is installed the right way?
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Offline giorno71

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Re: overheating
« Reply #13 on: August 01, 2009, 06:44:44 PM »
yep   it is  double checked that
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Offline BlackYJ

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Re: overheating
« Reply #14 on: August 04, 2009, 07:18:50 AM »
The rads are the same between the 2.5 L and 4.0L.

Is the rad clogged with mud?  Do you have a winch blocking the rad?
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