over heating question
CF Veteran
Joined: Oct 2009
Posts: 1,155
Likes: 0
From: Virginia Beach, VA
Year: 1991
Model: Cherokee
Engine: 4.0L H.O.
CF Veteran
Joined: Oct 2009
Posts: 1,155
Likes: 0
From: Virginia Beach, VA
Year: 1991
Model: Cherokee
Engine: 4.0L H.O.
Apply power to 30 should not have power coming out of 87 but should out of 85 (ground). While powering 30 power 86 as well now you should have power coming out of 87 as well. If this all works your relay is good.
In this case backtrack where 86 was plugged in. This should go to your temp sensor check that out.
In this case backtrack where 86 was plugged in. This should go to your temp sensor check that out.
Senior Member
Joined: Mar 2010
Posts: 812
Likes: 1
From: Eugene, OR
Year: 1989
Model: Cherokee
Engine: 4.7 Stroker I6
you know the aux fan wont come on til 220 degrees, will it get that hot if you let it just sit and idle?
still though the clutch fan should take care of it, id replace it or move the an efan kit
still though the clutch fan should take care of it, id replace it or move the an efan kit
Thread Starter
Seasoned Member
Joined: Dec 2011
Posts: 437
Likes: 0
From: Southern Maine
Year: 1999
Model: Cherokee
Engine: 4.0L
Good point it def. Went over 220 and it never came on tho one of the guys at my work said to.look over the thermostat spring on the clutch fan that it may be dirty or just in bad shape
CF Veteran
Joined: Oct 2009
Posts: 1,155
Likes: 0
From: Virginia Beach, VA
Year: 1991
Model: Cherokee
Engine: 4.0L H.O.
CF Veteran
Joined: Oct 2009
Posts: 1,155
Likes: 0
From: Virginia Beach, VA
Year: 1991
Model: Cherokee
Engine: 4.0L H.O.
Thread Starter
Seasoned Member
Joined: Dec 2011
Posts: 437
Likes: 0
From: Southern Maine
Year: 1999
Model: Cherokee
Engine: 4.0L
Sweet thanx guys I ended up going with a clutch fan from Napa they are right next to my work so if it ever craps out on me they will give me another one free of charge :-)
Senior Member
Joined: Jan 2011
Posts: 689
Likes: 2
From: Upstate N.Y
Year: 2000.1999,1996
Model: Cherokee
Engine: 4.0
Up to the year 99 electric fan's will come on with the a/c or a rough temp of 215-218,On the years 2000- up the electric fan will only come on with the temp of roughly 215-218, unless you have it flashed at dealer to engage with the a/c.
Senior Member
Joined: Jan 2011
Posts: 689
Likes: 2
From: Upstate N.Y
Year: 2000.1999,1996
Model: Cherokee
Engine: 4.0
Yup you will get a whole 1 to 2 hp with this swap.Not really worth the security of a mechanical fan if your out in the woods and the electric motor's fry.


