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Unread 04-19-2009, 06:50 PM   #1
89jpcherokee
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4.0 overheating problem

ok i got a mystery on my hands my cherokee will overheat... replaced the thermostat with housing and the water pump (which WAS bad) still is getting too hot at about 180 the warning light kicks on but dosnt seem like its gettin that hot yet also my electric fan doenst kick on... seems fine sitting there at idle but as soon as i drive it anywhere it starts to overheat

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Unread 04-19-2009, 07:08 PM   #2
xjfever
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The electric fan shouldn't kick on until around 212*. The normal operating temp is 210*. How hot is it getting? And it getting hotter while driving leads to a low flow problem. You most likely have some blockage in the radiator.
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Unread 04-19-2009, 07:12 PM   #3
89jpcherokee
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Quote:
Originally Posted by xjfever View Post
The electric fan shouldn't kick on until around 212*. The normal operating temp is 210*. How hot is it getting? And it getting hotter while driving leads to a low flow problem. You most likely have some blockage in the radiator.
we flushed the system twice seems like its fine another thing is that how this all started was it blew the lower radiator hose then the next morning it blew the upper
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Unread 04-19-2009, 07:13 PM   #4
jeepkid03
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your warning light kicks on at 180 degrees??? Cherokees are designed to run at 210. You may have more than one problem. Mine overheated once and it turned out to be a bunch of things at once that made the cooling system weak. Once the temp goes past 210 degrees you should hear the electric fan kick on. If it doesnt and the temp keeps rising than you have to check the wiring for the electric fan and see that its working properly. You said that you replaced the water pump... what about the fan clutch? They only last about 5 years. Some other issues could be the thermostat or the radiator. Mine was all blocked up once and the radiator looked pretty nasty as well as the coolant. What year is your jeep? Your user name has "89" in it so if your jeep is an '89 then it has the "closed" cooling system. My old '90 had the same thing. Make sure your coolant bottle isnt leaking or cracked and try putting a new cap on it to hold the pressure. Did you make sure and "burp" the air out of the system when you put in the new water pump? Hope these things can help you track down the problem...also check to make sure the jeep is actually overheating and that your gauge isn't messin' with ya

Edit: took me too long to type this so didnt see the posts above...sounds like a blocked radiator
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Unread 04-19-2009, 07:34 PM   #5
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OP has a closed cooling system, which is VERY prone to air bubbles messing things up. You need to let out the air, and you should be fine. You should be able to remove the temperature gauge sender near the back of the head to get most of it out.
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Unread 04-19-2009, 07:38 PM   #6
xjfever
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I completely looked over the year model, and would agree completely that you have air trapped in the system. Burping the system should fix your problems.http://www.lunghd.com/Tech_Articles/...BurpAirMod.htm
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Unread 04-19-2009, 07:40 PM   #7
89jpcherokee
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Originally Posted by jeepkid03 View Post
your warning light kicks on at 180 degrees??? Cherokees are designed to run at 210. You may have more than one problem. Mine overheated once and it turned out to be a bunch of things at once that made the cooling system weak. Once the temp goes past 210 degrees you should hear the electric fan kick on. If it doesnt and the temp keeps rising than you have to check the wiring for the electric fan and see that its working properly. You said that you replaced the water pump... what about the fan clutch? They only last about 5 years. Some other issues could be the thermostat or the radiator. Mine was all blocked up once and the radiator looked pretty nasty as well as the coolant. What year is your jeep? Your user name has "89" in it so if your jeep is an '89 then it has the "closed" cooling system. My old '90 had the same thing. Make sure your coolant bottle isnt leaking or cracked and try putting a new cap on it to hold the pressure. Did you make sure and "burp" the air out of the system when you put in the new water pump? Hope these things can help you track down the problem...also check to make sure the jeep is actually overheating and that your gauge isn't messin' with ya

Edit: took me too long to type this so didnt see the posts above...sounds like a blocked radiator
yes it is an 89 and the fan and the radiator do seem "old" to say the least we did burp the system and the collant bottle is new also (was doing the plugs one day and was too short to reach the last one and slipped sitting on the engine and my elbow landed on the bottle) also another thing is that if you let the truck heat up the coolant in the bottle will surge up and down and spill out of the bottle the hotter the engine gets the more violent the surge (splashing and what not) i dont know if im missing something or adding too much coolant, not enough coolant or if its another broken part radiator etc... also i dont have a garage im doing this in my backyard

i will burp the system again tomarrow and see if it helps any thanks a lot so far guys
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Unread 04-19-2009, 08:01 PM   #8
xjfever
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Just a thought if you replaced the lower hose, did you get one with a spring in it? If not could be the hose collapsing and cutting off the flow of coolant while driving. That would explain the temp being okay when idling and it running hot when driving.
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  2. Sold'99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
  3. Sold '00 TJ, 4" lift, rusty's adjustable control arms, skyjacker shocks, rock krawler adj. trac-bar,rugged ridge SYE and RE driveshaft, soft 8's, 35" mud king xt's,XJ HP D30 w/aussie locker, 4:88 yukon gears, hella 500's, rock crusher diff covers
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Unread 04-19-2009, 09:12 PM   #9
89jpcherokee
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my orig hose didnt have a spring in it tho
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Unread 04-19-2009, 11:38 PM   #10
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Quote:
Originally Posted by 89jpcherokee View Post
we flushed the system twice seems like its fine another thing is that how this all started was it blew the lower radiator hose then the next morning it blew the upper

Quote:
Originally Posted by 89jpcherokee View Post
also another thing is that if you let the truck heat up the coolant in the bottle will surge up and down and spill out of the bottle the hotter the engine gets the more violent the surge (splashing and what not) i dont know if im missing something or adding too much coolant, not enough coolant or if its another broken part radiator etc..
Check to see if the upper radiator hose is rock hard when warmed up. Make sure the cap is on the resevoir. If it's rock hard you have a bad head gasket. Would explain everything in the quotes above.
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Unread 04-20-2009, 04:01 PM   #11
89jpcherokee
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ok so i got home today added some coolant to it the bottle was bone dry... took it out and drove it for about 5 minutes with the heat on and the temp light started to come on very dim then getting brighter... i shut the heat off and almost immediately the light went out... drove it around for like 15 more minutes with no problem except everytime i turn the heat on the light comes on also the radiator hoses are kind of hard but not anything that seems too unusual when you say "rock hard" you should not be able to squeeze it easily i presume mine wasnt impossible to squeeze but did have some pressure
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Unread 04-20-2009, 04:03 PM   #12
89jpcherokee
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also its a cool day out today with heavy rain its about 50 here
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Unread 04-21-2009, 10:11 AM   #13
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burp the system with the Air Conditioner ON. lots of people forget about the air conditioner when burping. if there is air inside your heater core, you need to get it out! my .02
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Unread 04-21-2009, 11:33 AM   #14
bhicks
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Quote:
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burp the system with the Air Conditioner ON. lots of people forget about the air conditioner when burping. if there is air inside your heater core, you need to get it out! my .02

I recently replaced my engine and went ahead and replaced the radiator, water pump, thermostat and all hoses at the same time. I oredered my radiator from radiatorbarn.com and it is the 3 layer kind. My engine actually runs hotter now then before. I assume I probably have all types of air bubbles. You mentioned the need to burp the system. How do you do that?
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Unread 04-21-2009, 05:55 PM   #15
89jpcherokee
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its says above how to. click on the link that xjfever posted i think i have a little more problem then trapped air i think air is getting added the system via the head gasket luckily i work at a jeep dealer and have the service manual so it should be very straight forward now
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