Question about 1998 Jeep Cherokee

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Why does my jeep run hot even though it dont have a thermostat

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The galleries in the coolant passages are plugged up or a plugged heater core and or radiator will do that as well

Posted on Feb 04, 2010

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I just replace a hose on my jeep larado 4.0 and now its running hot, no water in oil, no sighs of any enteral damage, just getting hot, over heating


check that you do not have an air lock...while the engine is running check the hoses to see if one is cold, run the engine with the header bottle cap off and if one of the hoses has a bleed nozzle then open it until you have continuous water running and not spitting.
Do not put cold water in a hot engine though, it can blow the head gasket.

Jan 15, 2013 | 1996 Jeep Grand Cherokee

1 Answer

93 cherokee overheating after electric fan unplugged plugged back in still overheated boiled radiater newcap thermostat waterpump milled head new gasket runs good till u go up hill r highway speeds over60...


Did you check if the fan starts up when the car has warmed up? The switch may have stopped working. Otherwise clean out the radiator and the outside. Make sure the thermostat is opening, even though it is new doesn't mean that it works. Start from cold and hold the top hose, it will get hot suddenly if it opens. Make sure all the hoses are clear and not collapsed inside.

Oct 20, 2011 | 1993 Jeep Cherokee Country

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2000 Jeep Grand Cherokee Leredo is overheating I changed thermostat also my fan is not working and keeps saying coolnd low and its full and the heat in the car will not run hot it stays cold


Sounds like some type of blockage in the system.
with the car cool open the radiator cap, start the engine to see if the coolant has flow.
Even though you just put in a new thermostat it can still be bad,I've had this happen to me a few times.
If the flow seems slow to nill you can also try removing the thermostat all together and giving that a try.
You can test the thermostat in a boiling pot of water.
If ir is totally not the thermostat then there could be a few cooling chambers blocked in the radiator.
This can be repaired in most cases by a "Rod out" at a local radiator shop.
I think the problem is more twards the thermostat for the reason you stated about your heater.
good luck,Gary.

Sep 21, 2011 | 2000 Jeep Grand Cherokee

1 Answer

1987 jeep cherokee 4.0 straight six. runs hot. replaced thermostat still runs hot. what other things may cause this so that im not taken advantage of?


you dont say how hot it runs, could be head gasket problems, or you my just have an air lock in the cooling system

Jan 25, 2011 | 1987 Jeep Cherokee

1 Answer

I put new thermostat on and it started running very hot again. I drilled to holes in the thermostat to increase the water flow and it still ran hot. It's weird cause the bottom radiator hose was running...


Flushing a radiator at home is most often a waste of time. The chemicals used by a radiator shop are far stronger than anything you get at the parts supply house. What happens is that the flow you see is deceptive as the water tends to flow around a partial restriction and does nothing to remove it.
Though your garden hose has a lot of pressure it doesn't have the volume necessary. A garden hose will usually be sufficient to flush out a heater core though as it's smaller.
Have a radiator shop flush your radiator core and have a hydrocarbon test done on the cooling system to eliminate the possibility of head gasket problems. When re-filling the system, turn the engine off just before it reaches 210 degrees and let it sit for a few minutes so the thermostat can open, then continue filling. Always fill with the heat on high. Thermostat goes in with the spring end into the engine.Forget about the water pump...unless you got one made for a twin engine marine (CCW) application it has nothing to do with the problem though I've heard but never actually seen that the belt can be installed so it turns backwards.
When the engine is at operating temp cover the grille and force it to nearly go into overheat...the electric fan should come on and the mechanical fan should lock up to try to counteract that.
Don't open the system when it's hot (you found that out already). And, don't allow the engine to actually overheat.
My bet without seeing it? Likely a partially obstructed radiator. 4.0 engines make a lot of rust residue even when maintained. If that's what you have in there, or even the 4cyl. It is more than likely.

Jan 19, 2011 | 1989 Jeep Wrangler

1 Answer

My 2004 Jeep Cheokee loredo is running hot. Could


Could be several things,

1. thermostat
2. water pump
3. fan motor is bad (is the fan running when at temp?)
4. fan motor relay

Is it running hot all the time or just when setting idle?

May 16, 2010 | 2004 Jeep Grand Cherokee

1 Answer

After running the engine for awhile in stop and go traffic it runs hot and start to sputter and cough and quits running. hard to crank till it cools down


CHECK COOLANT LEVEL.CHECK THERMOSTAT.IF TOP RADIATOR HOSE DONT GET HOT IN 10 MINUTES AFTER FIRST STARTING CAR IN MORNING .AND JUST THE BOTTOM HOSE.THERMOSTAT STICKING CLOSE.IF THERMOSTAT FINE.PROBLEM COULD BE CLOGGED RADIATOR OR ENGINE BLOCK CLOGGED OR FAULTY WATER PUMP.

Aug 01, 2009 | Jeep Cherokee Cars & Trucks

1 Answer

Overheating jeep cherokee 1991


might be blocked catalitic converter or as simple as ignition timing . looks like you changed a lot of expensive things you also might want to get a different mechanic to help you

May 30, 2009 | 1991 Jeep Cherokee Limited

2 Answers

Normal coolant temp for 2003 Jeep Grand Cherokee city/highway V6


Your Jeep should have a 192 or 195 degree thermostat. Do u have to add coolant once in a while? If there is no coolant loss, no overheating problem, u shouldn't have to worry about it, it could be the temp. sending unit is not accurate. If it concerns u it would probably be worth it to remove the thermostat, check the temp rating on it(it should be stamped on it). Replace w/ a new one, and see what it indicates for temp then. Good luck, let me know what u find Curt

Mar 13, 2009 | 2003 Jeep Grand Cherokee

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