Running Hot - Can't Solve

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Jul 13, 2018 | 03:41 PM

#16

Bugout4x4

CF Veteran

Joined: May 2015

Posts: 4,481

Likes: 18

From: Arizona

Year: 97

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by Cummins93

I stand by my request even if just for the rule out factor. Add on to that check that the mechanical fan stops abruptly on a hot shutdown.

Aww, old school test of the fan clutch. Well done sir...

I don't see this mentioned much if at all my friend.

Jul 14, 2018 | 10:23 AM

#17

bluejeep2001

CF Veteran

Joined: Dec 2016

Posts: 1,736

Likes: 407

From: Long Island, New York

Year: 2001

Model: Cherokee (XJ)

Engine: 98 stroked 4.7

What's the abrupt shutdown test for the fan

Jul 14, 2018 | 11:41 AM

#18

Cummins93

CF Veteran

Joined: Mar 2015

Posts: 1,203

Likes: 155

From: Northern CT

Year: 1995

Model: Cherokee

Engine: Turbo 4.0

While hot find a long hill to make a run up, at the top pull over pop the hood and look at the mechanical fan while you kill the engine. Does it stop almost immediately?

Jul 14, 2018 | 01:36 PM

#19

Ralph77

CF Veteran

Joined: Oct 2015

Posts: 7,517

Likes: 1,626

Year: 2000

Model: Cherokee (XJ)

Quote:

Originally Posted by bluejeep2001

What's the abrupt shutdown test for the fan

My Jeep ran fine. Never overheated. But then somebody posted a link to this video. Mine spun after the engine was shut off. So despite that I was not having any problems I replaced it anyway.

Jul 15, 2018 | 09:27 AM

#20

Waynerd

CF Veteran

Joined: Jan 2015

Posts: 1,469

Likes: 26

From: North canaan Connecticut

Year: 01, 99, 98, 98,98

Model: Cherokee

Engine: 4.0

I’m beginning to think that maybe people with unsolvable overheating need to start flushing with vinegar or something similar that will break down mineral deposits. When every piece of the cooling system is new and it still overheats then it might be a problem with heat transfer. I think as a guideline the fuel trims and related areas should also be checked as an engine running lean could also produce that too much heat. If that all checks out I would think flushing with an acidic liquid would be worth a try. Of course do so carefully as it could eat away at good metal if left in too long or too acidic. I have tried to find out what ingredients are in the Preston’s flush and similar products but I haven’t had any luck. Not sure whether they will actually dissolve minerals or heavy metals. I have read posts from non jeep forums where using vinegar or similar works well and works when nothing else would.

Nov 7, 2018 | 08:22 AM

#21

russiebear

Newbie

Joined: Nov 2018

Posts: 6

Likes: 0

From: Gulfport, Ms

Year: 1996 SE

Model: Cherokee (XJ)

Engine: 4.0

on my 96 the ac condenser was in front of the engine radiator and nearly no space between them. So I was only able to separate them by about 3/4" with a plywood spacer I made. It was enough to make a difference and keep it from overheating. Wish you luck