4.0 running hot

95XJ · 05-04-2008, 07:54 PM

I have a 95 Cherokee 4.0 with 104kmi. While idling fully warmed up, the temp gauge may run around 210 but rises as high as 225 degrees before the auxiliary fan even kicks on (which really doesn't help). While driving, though it stays right around 200-210 degrees. Could this be a possible issue of some kind?

Thanks

COSXJFAN · 05-04-2008, 08:09 PM

Not likely! The 4.0 loves to run at 210. If it is hotter than it usually is, it my need a flush. When did you do it last?

skarpenz · 05-04-2008, 08:38 PM

If mine sits for awhile running it will go up to around 220, but when driving normally it stays at 210.

ColoradoJeepXJ · 05-04-2008, 08:43 PM

My XJ runs 190 to 200. The only time it will go over 200 is crawling or bumper to bumper in hot weather and even then it will not go over 210.

skarpenz · 05-04-2008, 08:49 PM

Looks like it just depends on the individual motor then.

dabeast727 · 05-04-2008, 09:22 PM

Yea aflush would be good, if it goes too high and then returns to normal id say replace your thermostat, its extremely easy takes like 15 minutes, $15 part. I actually disconnected my aux fan b/c one time it just wouldnt turn off after i cut the engine off. Never got around to putitn it back on ahah.

95XJ · 05-04-2008, 10:30 PM

I just got the jeep 3 days ago. I have always wanted an XJ and finally got one with no rust, low miles for a jeep and a 5spd 4.0 for a great deal!

I was actually planning on flushing the system and replacing the thermostat either way, as the coolant was dirty and the "running hot" is intermittent.

Hopefully that does the trick.

BTW, I noticed, the male tip on the radiator fill going to the coolant reservoir with a hose was 3/4 broken off and coolant would not transfer from the radiator to the reservoir as supposed to (it leaked)...so I temporarily rigged it up that way it does its job correctly...still didn't solve the hot running issue though...

Any fix to the broken male tip without a radiator replacement?

COSXJFAN · 05-05-2008, 12:10 AM

Is it plastic or brass?

ColoradoJeepXJ · 05-05-2008, 12:18 AM

Solder it.

BlueXJ · 05-05-2008, 01:14 AM

Might need to take it to a radiator repair shop to get the overflow/recovery tank connection resoldered.

XJ Stryker · 05-05-2008, 05:51 AM

Quote:

Originally Posted by ColoradoJeepXJ

Solder it.

X2

95XJ · 05-05-2008, 09:00 PM

Its Plastic!

I was able to get the hose on with a clamp and it seems to be working so far! I chipped away at some plastic near the filler neck in order the get the hose on the fitting farther.

BlueXJ · 05-05-2008, 09:44 PM

Quote:

Originally Posted by 95XJ

Its Plastic!

I was able to get the hose on with a clamp and it seems to be working so far! I chipped away at some plastic near the filler neck in order the get the hose on the fitting farther.

You may need a new radiator https://www.radiatorbarn.com/search....oduct=radiator

Might just be your answer.

COSXJFAN · 05-05-2008, 11:12 PM

That is a 2 row. I'm sure it is a great radiator. FYI this is a link to a true 3 row. I have it and it works great. I live at 6800' and wheel at 10,000' + and need the most cooling available. It is all metal construction NO PLASTIC ANYWHERE!!! IMHO, plastic does not belong on a radiator!! Good luck!!
http://cgi.ebay.com/ws/eBayISAPI.dll...m=380005071696

95XJ · 05-06-2008, 08:11 PM

Today I flushed the cooling system over and over and I used a flush detergent as well. After the system was completely clean, I replaced the thermostat and refilled the system with 50% water 50% antifreeze.

It ran great all day, right around 200 but when it sits idling...1/2 the time it rises right to about 220. What could this be now that I have a new thermostat and a clean cooling system?

05-04-2008, 07:54 PM	#1
95XJ Newbie Join Date: May 2008 Posts: 26 My Photos 1995 Cherokee Year: 1995 Model: Cherokee Engine: 4.0 H.O. Transmission: AX-15 Transfer Case: New Process 231 Front Axle: Dana 30 Rear Axle: Dana 35 Tires: 30x9.5x15 Mickey Thompsons Lift Specifications: 3" Rustys Full Pack 305STS Misc Accessories: 15" Eagle Alloys Series 187 Wheels	4.0 running hot I have a 95 Cherokee 4.0 with 104kmi. While idling fully warmed up, the temp gauge may run around 210 but rises as high as 225 degrees before the auxiliary fan even kicks on (which really doesn't help). While driving, though it stays right around 200-210 degrees. Could this be a possible issue of some kind? Thanks

05-04-2008, 08:09 PM	#2
COSXJFAN BROWN CHICKEN, BROWN COW! Join Date: Apr 2008 Location: Colorado Springs Posts: 6,301 My Photos 1987 Wagokee Cherokee Year: 1987 Wagokee Model: Cherokee Engine: 4.0 Renny Transmission: AW-4 Transfer Case: NP 242 HD drive shaft Front Axle: HP non-C.A.D. Dana 30 w/ 4.88s (Detroit Locker) Rear Axle: Dana 44 w/ 4.88s (Yukon Spooled) Tires: 33X12.5-15 Pro Comp MTs Lift Specifications: Hodgepodge 6.5 front 5.5 rear Misc Accessories: custom 2.5" exhaust, cold air intake, homebrew bumpers & armor, winch	Not likely! The 4.0 loves to run at 210. If it is hotter than it usually is, it my need a flush. When did you do it last? __________________ STEELER FAN TIL DEATH!!! BAN OWNERS, NOT BREEDS!!! AMERICAN PIT BULL TERRIERS ARE GREAT PETS!!!

05-04-2008, 08:43 PM	#4
ColoradoJeepXJ Senior Member Join Date: Apr 2008 Location: Wheat Ridge, Colorado Posts: 816 My Photos 1990 2dr base Cherokee Year: 1990 2dr base Model: Cherokee Engine: 4.0L Transmission: AW4 Transfer Case: NP231 Front Axle: D-30 Rear Axle: D-44 locked Tires: 33" x 12.5 M/S Lift Specifications: 5+" Misc Accessories: Rails, skids, SYE, hood vents, TC drop, lights, CB, CD-MP3, Road GPS, Trail GPS	My XJ runs 190 to 200. The only time it will go over 200 is crawling or bumper to bumper in hot weather and even then it will not go over 210. __________________ 1990 2dr Base - Toy 1989 4dr Limited - DD 1979 F150 4x4 - Project 1993 Ford Escort - POS, but it runs

05-04-2008, 09:22 PM	#6
dabeast727 Seasoned Member Join Date: Dec 2007 Location: raleigh, nc Posts: 489 My Photos 1999 Cherokee Year: 1999 Model: Cherokee Engine: 4.0L HO Transmission: ax15 Transfer Case: np231/SYE/cv driveshaft Front Axle: dana30HP Rear Axle: 8.25 29 spline Tires: 32x11.50 bfg MT Lift Specifications: 4.5" Rubicon Express Misc Accessories: light bar, TNT bumper, 9k tmax winch, black steelies	Yea aflush would be good, if it goes too high and then returns to normal id say replace your thermostat, its extremely easy takes like 15 minutes, $15 part. I actually disconnected my aux fan b/c one time it just wouldnt turn off after i cut the engine off. Never got around to putitn it back on ahah. __________________ 1999 cherokee, white, 2 dr, manual, 95k miles -4.5" Rubicon Express superflex with full packs, plus 1.5" spacers in the front to level out winch/bumper -32" BFG MTs -15" black steelies -ARB snorkel -TNT winch bumper -Armor: eng./t-case skid plates, differential shield, TNT bumper w/ cross member skid. -T-MAX 9,000lb winch -Dana 30HP front, Crystler 8.25 rear (29 spline) -Stock gears, 3.07 -4 5.5" roof lights Plans: 35" BFG AT 4.56 5.5" RE springs & 1" shackles

05-05-2008, 12:10 AM	#8
COSXJFAN BROWN CHICKEN, BROWN COW! Join Date: Apr 2008 Location: Colorado Springs Posts: 6,301 My Photos 1987 Wagokee Cherokee Year: 1987 Wagokee Model: Cherokee Engine: 4.0 Renny Transmission: AW-4 Transfer Case: NP 242 HD drive shaft Front Axle: HP non-C.A.D. Dana 30 w/ 4.88s (Detroit Locker) Rear Axle: Dana 44 w/ 4.88s (Yukon Spooled) Tires: 33X12.5-15 Pro Comp MTs Lift Specifications: Hodgepodge 6.5 front 5.5 rear Misc Accessories: custom 2.5" exhaust, cold air intake, homebrew bumpers & armor, winch	Is it plastic or brass? __________________ STEELER FAN TIL DEATH!!! BAN OWNERS, NOT BREEDS!!! AMERICAN PIT BULL TERRIERS ARE GREAT PETS!!!

05-04-2008, 08:38 PM	#3
skarpenz Member Join Date: Apr 2008 Posts: 243 My Photos 1996 Cherokee Year: 1996 Model: Cherokee Engine: 4.0 HO Transmission: AW4 Auto Tires: 235/75R15 Lift Specifications: Factory Misc Accessories: Fender trim, Flowmaster 44	If mine sits for awhile running it will go up to around 220, but when driving normally it stays at 210.

05-04-2008, 08:49 PM	#5
skarpenz Member Join Date: Apr 2008 Posts: 243 My Photos 1996 Cherokee Year: 1996 Model: Cherokee Engine: 4.0 HO Transmission: AW4 Auto Tires: 235/75R15 Lift Specifications: Factory Misc Accessories: Fender trim, Flowmaster 44	Looks like it just depends on the individual motor then.

05-04-2008, 10:30 PM	#7
95XJ Newbie Join Date: May 2008 Posts: 26 My Photos 1995 Cherokee Year: 1995 Model: Cherokee Engine: 4.0 H.O. Transmission: AX-15 Transfer Case: New Process 231 Front Axle: Dana 30 Rear Axle: Dana 35 Tires: 30x9.5x15 Mickey Thompsons Lift Specifications: 3" Rustys Full Pack 305STS Misc Accessories: 15" Eagle Alloys Series 187 Wheels	I just got the jeep 3 days ago. I have always wanted an XJ and finally got one with no rust, low miles for a jeep and a 5spd 4.0 for a great deal! I was actually planning on flushing the system and replacing the thermostat either way, as the coolant was dirty and the "running hot" is intermittent. Hopefully that does the trick. BTW, I noticed, the male tip on the radiator fill going to the coolant reservoir with a hose was 3/4 broken off and coolant would not transfer from the radiator to the reservoir as supposed to (it leaked)...so I temporarily rigged it up that way it does its job correctly...still didn't solve the hot running issue though... Any fix to the broken male tip without a radiator replacement?

05-05-2008, 12:18 AM	#9
ColoradoJeepXJ Senior Member Join Date: Apr 2008 Location: Wheat Ridge, Colorado Posts: 816 My Photos 1990 2dr base Cherokee Year: 1990 2dr base Model: Cherokee Engine: 4.0L Transmission: AW4 Transfer Case: NP231 Front Axle: D-30 Rear Axle: D-44 locked Tires: 33" x 12.5 M/S Lift Specifications: 5+" Misc Accessories: Rails, skids, SYE, hood vents, TC drop, lights, CB, CD-MP3, Road GPS, Trail GPS	Solder it. __________________ 1990 2dr Base - Toy 1989 4dr Limited - DD 1979 F150 4x4 - Project 1993 Ford Escort - POS, but it runs

05-05-2008, 01:14 AM	#10
BlueXJ Renix Super Guru Join Date: Mar 2008 Location: In yourz postez fissin jurr spelinzs Posts: 19,784 My Photos 1990/1989 Cherokee Year: 1990/1989 Model: Cherokee Engine: 4.0L Renix Transmission: AW4/AX15 Transfer Case: NP242 Front Axle: Dana30 Rear Axle: 8.25 Chryco 29 spline Tires: 31 x 10.50 BFG KOs Lift Specifications: 3.5" Rubicon Express Misc Accessories: Homemade bumpers & MM Winch JKS Trackbar ZJ steering	Might need to take it to a radiator repair shop to get the overflow/recovery tank connection resoldered. __________________ JEEP I bow to its almighty power which no mortal 4x4 can match. R.I.P. Zachman you will be missed. CF the friendly forum http://www.xjtalk.com/index.php www.ComancheClub.com CBW Member #69

05-05-2008, 09:00 PM	#12
95XJ Newbie Join Date: May 2008 Posts: 26 My Photos 1995 Cherokee Year: 1995 Model: Cherokee Engine: 4.0 H.O. Transmission: AX-15 Transfer Case: New Process 231 Front Axle: Dana 30 Rear Axle: Dana 35 Tires: 30x9.5x15 Mickey Thompsons Lift Specifications: 3" Rustys Full Pack 305STS Misc Accessories: 15" Eagle Alloys Series 187 Wheels	Its Plastic! I was able to get the hose on with a clamp and it seems to be working so far! I chipped away at some plastic near the filler neck in order the get the hose on the fitting farther.

05-05-2008, 11:12 PM	#14
COSXJFAN BROWN CHICKEN, BROWN COW! Join Date: Apr 2008 Location: Colorado Springs Posts: 6,301 My Photos 1987 Wagokee Cherokee Year: 1987 Wagokee Model: Cherokee Engine: 4.0 Renny Transmission: AW-4 Transfer Case: NP 242 HD drive shaft Front Axle: HP non-C.A.D. Dana 30 w/ 4.88s (Detroit Locker) Rear Axle: Dana 44 w/ 4.88s (Yukon Spooled) Tires: 33X12.5-15 Pro Comp MTs Lift Specifications: Hodgepodge 6.5 front 5.5 rear Misc Accessories: custom 2.5" exhaust, cold air intake, homebrew bumpers & armor, winch	That is a 2 row. I'm sure it is a great radiator. FYI this is a link to a true 3 row. I have it and it works great. I live at 6800' and wheel at 10,000' + and need the most cooling available. It is all metal construction NO PLASTIC ANYWHERE!!! IMHO, plastic does not belong on a radiator!! Good luck!! http://cgi.ebay.com/ws/eBayISAPI.dll...m=380005071696 __________________ STEELER FAN TIL DEATH!!! BAN OWNERS, NOT BREEDS!!! AMERICAN PIT BULL TERRIERS ARE GREAT PETS!!!

05-06-2008, 08:11 PM	#15
95XJ Newbie Join Date: May 2008 Posts: 26 My Photos 1995 Cherokee Year: 1995 Model: Cherokee Engine: 4.0 H.O. Transmission: AX-15 Transfer Case: New Process 231 Front Axle: Dana 30 Rear Axle: Dana 35 Tires: 30x9.5x15 Mickey Thompsons Lift Specifications: 3" Rustys Full Pack 305STS Misc Accessories: 15" Eagle Alloys Series 187 Wheels	Today I flushed the cooling system over and over and I used a flush detergent as well. After the system was completely clean, I replaced the thermostat and refilled the system with 50% water 50% antifreeze. It ran great all day, right around 200 but when it sits idling...1/2 the time it rises right to about 220. What could this be now that I have a new thermostat and a clean cooling system?

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