Ongoing overheating 96 Cherokee, EVERYTHING Replaced (NEED HELP!)
Newbie
Joined: Jan 2011
Posts: 16
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Model: Cherokee
CF Veteran
Joined: Apr 2009
Posts: 4,734
Likes: 12
Year: 2015, 2012
Model: Grand Cherokee (WK2)
Engine: 3.6L
I did all you did, and more.
First head was cracked, replaced it with a lower -mileage used one.
Blew out the rear head freeze plug 3 times.
Rebuilt the block and head, still ran hot. Head was Magnafluxed.
Pulled that head off and replaced it with a 3rd (rebuilt) one.
That cured it.
So your head is probably cracked internally where it can't be found, like mine was.
'92 4.0 Laredo.
First head was cracked, replaced it with a lower -mileage used one.
Blew out the rear head freeze plug 3 times.
Rebuilt the block and head, still ran hot. Head was Magnafluxed.
Pulled that head off and replaced it with a 3rd (rebuilt) one.
That cured it.
So your head is probably cracked internally where it can't be found, like mine was.
'92 4.0 Laredo.
CF Veteran
Joined: Apr 2011
Posts: 4,825
Likes: 2
From: Indianapolis
Year: '99 and '91
Model: Cherokee
I'd still take that fail safe outta there.
If the fan clutch hasn't been replaced it probably needs to be. That fluid stuff in them goes bad after so long. And far as I can tell there is no definitive test to tell for sure if its bad.
Also its a possibility that that two core radiator isn't cooling as well as a stock one.
If the fan clutch hasn't been replaced it probably needs to be. That fluid stuff in them goes bad after so long. And far as I can tell there is no definitive test to tell for sure if its bad.
Also its a possibility that that two core radiator isn't cooling as well as a stock one.
CF Veteran
Joined: Apr 2011
Posts: 4,825
Likes: 2
From: Indianapolis
Year: '99 and '91
Model: Cherokee
Originally Posted by Firestorm500
I did all you did, and more.
First head was cracked, replaced it with a lower -mileage used one.
Blew out the rear head freeze plug 3 times.
Rebuilt the block and head, still ran hot. Head was Magnafluxed.
Pulled that head off and replaced it with a 3rd (rebuilt) one.
That cured it.
So your head is probably cracked internally where it can't be found, like mine was.
'92 4.0 Laredo.
First head was cracked, replaced it with a lower -mileage used one.
Blew out the rear head freeze plug 3 times.
Rebuilt the block and head, still ran hot. Head was Magnafluxed.
Pulled that head off and replaced it with a 3rd (rebuilt) one.
That cured it.
So your head is probably cracked internally where it can't be found, like mine was.
'92 4.0 Laredo.
CF Veteran
Joined: Nov 2009
Posts: 8,172
Likes: 17
From: The Republic of TEXAS
Year: 1998
Model: Cherokee
Engine: 4.0L HO
Any details when running 200 vs 230? Both temps verified? Ambient temp, driving conditions, 230 at idle/hi-way speeds, etc.?
Thread Starter
Junior Member
Joined: Aug 2012
Posts: 51
Likes: 0
Model: Cherokee
Originally Posted by DieselD
I'd still take that fail safe outta there.
If the fan clutch hasn't been replaced it probably needs to be. That fluid stuff in them goes bad after so long. And far as I can tell there is no definitive test to tell for sure if its bad.
Also its a possibility that that two core radiator isn't cooling as well as a stock one.
If the fan clutch hasn't been replaced it probably needs to be. That fluid stuff in them goes bad after so long. And far as I can tell there is no definitive test to tell for sure if its bad.
Also its a possibility that that two core radiator isn't cooling as well as a stock one.
Fan clutch Is brand New
CF Veteran
Joined: Apr 2011
Posts: 4,825
Likes: 2
From: Indianapolis
Year: '99 and '91
Model: Cherokee
I'd say try a stock radiator. Go pull the cleanest looking Ind from a junkyard or use you old one of it done leak clean it out real good and see if that helps.
Thread Starter
Junior Member
Joined: Aug 2012
Posts: 51
Likes: 0
Model: Cherokee
Originally Posted by DieselD
I'd say try a stock radiator. Go pull the cleanest looking Ind from a junkyard or use you old one of it done leak clean it out real good and see if that helps.
