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Unread 01-17-2014, 04:43 PM   #1
lcplsmash
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1989 XJ Cherokee 
 
Join Date: Jan 2014
Posts: 4
:confused: 89 XJ overheating

I put a rebuilt 4.0 Renix engine in my XJ back in June. I replaced the water pump, radiator, t-stat, all the hoses, electic fan, fan clutch and expansion tank. It overheated to about 235-240 shortly after. I hooked up the electric fan to a switch and flushed and vacuum filled the system. I still have problems with it getting hot going up hill, while towing and long drives. It will stay about 220 or so when I turn the fan on. Going down hill and on the gas lightly it drops to 140-160. I will overheat sometimes while sitting at a light. Not sure what could cause this. Not sure if I blew the head gasket or not. Any thoughts on this matter would be helpful thanks.

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Unread 01-17-2014, 05:30 PM   #2
djb383
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1998 XJ Cherokee 
 
Join Date: Jan 2010
Location: The Republic of TEXAS
Posts: 2,201
Wow, a 100* swing???? Have u verified temps with a IR temp gun pointed at the stat cover? R all of the replacement parts new or used?
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Unread 01-17-2014, 05:39 PM   #3
lcplsmash
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1989 XJ Cherokee 
 
Join Date: Jan 2014
Posts: 4
Everything is new When I get the chance I'm gonna verify with a different temp gauge. I know the one in the dash is true but I will double check anyway. I'm just at a loss as what to do. I'm leaning toward maybe when I overheated I got a small leak in the head gasket. Unfortunately I have no way to check it at home.
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Unread 01-17-2014, 06:47 PM   #4
djb383
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1998 XJ Cherokee 
 
Join Date: Jan 2010
Location: The Republic of TEXAS
Posts: 2,201
Factory dash gauges r notoriously inaccurate. Check electrical connections on both the gauge and sending unit.
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Unread 01-17-2014, 06:52 PM   #5
lcplsmash
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1989 XJ Cherokee 
 
Join Date: Jan 2014
Posts: 4
I know that. I have already checked all that and all the sensors have been replaced. I have a dash mount gauge that I'm gonna hook up when I get the chance. do you know a good way to check for a blown head gasket?
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cherokee , cooling system , overheating , xj

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