OVER HEATING

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Apr 30, 2014 | 05:37 PM

#16

djb383

CF Veteran

Joined: Nov 2009

Posts: 8,172

Likes: 17

From: The Republic of TEXAS

Year: 1998

Model: Cherokee

Engine: 4.0L HO

Quote:

Originally Posted by FourEyes45

Sorry should have said that some one put 2 EFans on...No info on the fans.The top rad.hose is hot while the bottom is luke warm...air flow thru the fans seems ok...It will sit and Idle all day at 210-212,

I still suspect a radiator that's not at 100% efficiency (along with the efan set-up).

Seems odd that "it will sit and idle all day at 210" but "when I get in the woods and go real real slow it gets hot". Going real slow is not much different than sitting at idle. R u negotiating a really steep grade? What r the driving conditions "in the woods"?

Apr 30, 2014 | 08:04 PM

#17

salad

Herp Derp Jerp

Joined: Nov 2011

Posts: 18,251

Likes: 17

From: Parham, ON

Year: 1999

Model: Cherokee

Engine: 4.0L OBD-II

Quote:

Originally Posted by djb383

I've never seen any posts showing CFM numbers regarding the belt fan, so that's good info to know. Wonder what RPM made 5000 CFM? There were test numbers posted over at JeepForum.com regarding the OE factory efan (2300 CFM). Since the belt fan is obviously variable speed, CFM numbers will vary also.

I've seen the same for the OE electric fan. I can't remember if I found the 5k CFM on JeepForum or NAXJA. I don't remember if there was an operating RPM specified... probably up there with the clutch definitely heated up.

Quote:

Originally Posted by djb383

I just know that using my hands to feel the air being pulled/pushed by the 2 OE factory fans (highly scientific, I know), the air flow from the OE belt fan, at just above idle rpm, is way more than the OE efan.

Equally as scientific: The mechanical fan sounds like a big truck or plane when it gets going. The electric fan just kinda whines

Apr 30, 2014 | 08:16 PM

#18

FourEyes45

Thread Starter

Junior Member

Joined: Jan 2014

Posts: 50

Likes: 0

From: Lake Eufaula, Al.

Year: 1999

Model: Cherokee

Engine: 4.0

DJB when Im in the woods the motor is in more of a strain

Apr 30, 2014 | 08:56 PM

#19

djb383

CF Veteran

Joined: Nov 2009

Posts: 8,172

Likes: 17

From: The Republic of TEXAS

Year: 1998

Model: Cherokee

Engine: 4.0L HO

What "in the woods" and "driving real slow" is causing "more strain"?

Apr 30, 2014 | 09:02 PM

#20

FourEyes45

Thread Starter

Junior Member

Joined: Jan 2014

Posts: 50

Likes: 0

From: Lake Eufaula, Al.

Year: 1999

Model: Cherokee

Engine: 4.0

I'm just a ol dum Georgia Farm Boy...but when you are driving you have more moving parts which puts more strain on the Jeep>when you are sitting and the motor is at idle less moving parts.

Apr 30, 2014 | 10:29 PM

#21

djb383

CF Veteran

Joined: Nov 2009

Posts: 8,172

Likes: 17

From: The Republic of TEXAS

Year: 1998

Model: Cherokee

Engine: 4.0L HO

When moving, even slow, additional cooling air passes thru the rad vs when sitting still. Coolant flows thru the motor and rad faster when moving, even when moving slow. I'm just trying to understand what's causing the additional strain when in the woods......but again, I'm thinking a combo of reduced rad efficiency and reduced fan CFM air flow are the culprits.

Apr 30, 2014 | 11:29 PM

#22

FourEyes45

Thread Starter

Junior Member

Joined: Jan 2014

Posts: 50

Likes: 0

From: Lake Eufaula, Al.

Year: 1999

Model: Cherokee

Engine: 4.0

DJ thanks for the info...Guess I need to replace the rad. and get larger cfm fans

May 1, 2014 | 09:11 AM

#23

Rain

Junior Member

Joined: Mar 2013

Posts: 42

Likes: 0

Model: Cherokee

overheating fixed !!

Quote:

Originally Posted by FourEyes45

I have a 1999 Cherokee 4.0, I have replaced the water pump, thermostat and flush the radiator several times as long as I ride in town --stop and go its ok BUT when I get in the woods and go real real slow it gets hot..
WHAT could be the problem??????
Thanks for any help..
OL Man
Walt

--------------------------------------------------------------------------------------
I have a '93 XJ w/ 4.0 125,000 miles.....I too, had the same issue. I did the deed I had been dreading.. changed the valve cover gasket. I bought the best one. rubber and steel by fel-pro. All I expected was for the doggone oil leak to go away.. WELL. it's got more get up and go.. the overheating is history. and best of all. no more lubricating parking lots all over town... I mean it would dump a several tablespoons every time I parked. BIG TIP: when removing the cables over the cover..... all U need do is unscrew the mount they're on... and lift it over to the left..

May 1, 2014 | 09:27 AM

#24

djb383

CF Veteran

Joined: Nov 2009

Posts: 8,172

Likes: 17

From: The Republic of TEXAS

Year: 1998

Model: Cherokee

Engine: 4.0L HO

Hummm.

May 1, 2014 | 10:56 AM

#25

RTorrez1

CF Veteran

Joined: Sep 2011

Posts: 4,172

Likes: 4

From: Riviera, Texas

Year: 1998 Sport

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by Rain

WHAT ARE YOU TALKING ABOUT???????

May 1, 2014 | 11:09 AM

#26

salad

Herp Derp Jerp

Joined: Nov 2011

Posts: 18,251

Likes: 17

From: Parham, ON

Year: 1999

Model: Cherokee

Engine: 4.0L OBD-II

Valve cover gasket stopped his overheating problem, added 50 HP, and cured male pattern balding!

May 1, 2014 | 12:49 PM

#27

Strmtrooper70

Seasoned Member

Joined: Mar 2014

Posts: 352

Likes: 0

From: Los Angeles

Year: 1999

Model: Cherokee

Engine: 4.0

Inferesting....lol

May 1, 2014 | 01:47 PM

#28

colt44

Junior Member

Joined: Mar 2014

Posts: 75

Likes: 0

From: Mid-Mich.

Year: 1995

Model: Cherokee

You guys don't understand that oil acts as a insulator and holds heat next to the block. I just started wiping my block down with tissues before I drove it and engine temp dropped 20 degrees! Plus, I can do 100 ft. burn-outs in 2 wd. Only 25 ft. in 4 wd. Poor guy had his posts mixed up.......