Calgary Jeep Association
4x4 Related Groups => Tech Talk => Topic started by: giorno71 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.
-
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.
-
ya i have 2 eletric fans one pusher and one puller
-
is the 4.0L good? blown headgasket may cause that......
-
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
-
Air bubble?
-
Dont think so flushed the system twice and new antifreeze. even changed the temp sender
-
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?
-
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
-
Check your fuel pressure
Lean = HOT!
-
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
-
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.
-
The t-stat is installed the right way?
-
yep it is double checked that
-
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?
-
the rad is totaly clear of mud and debre and i do have a winch but have never had the problem wth the winch before.
-
I had the same problem when I swapped my 4.0L in. It ran great for 2 summers and then started getting pretty warm. This spring I just swapped in a heavy duty rad and it runs great
-
A bit of a longshot here...... are you actually overheating or are you just going by the gauge? It could be a bad sensor or a bad reading between the sensor and the computer. If you are running in the red I would think you should atleast see a little fluid in the overflow.
-
yep was going by the gauge then swaped it out...same thing... but yes it is over heating the coolent in the overflow looked like it was boiling... front end gets very hot and the firewall and floor at the shifter radiates a lot of heat