Question about 1998 Jeep Cherokee

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98 JEEP CHEROKEE, TEMPERATURE GAUGE JUMPS AROUND TO HOT- BACK TO NORMAL, TO HOT WHILE DRIVING- JUST REPLACED THE RADIATOR. COULD THIS BE A THERMOSTAT PROBLEM?

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Did u bleed the air from the cooling system? if not u need to do that, u have air pockets getting around the thermostat, to bleed raise the front up as high as poss with a floor jack, fill the radiator and coolant recovery tank as full as poss, then run engine until it reaches normal temp, then shut it down and run cold water over the radiator,this will draw the coolant out and the system will bleed the air out.

Posted on Aug 04, 2010

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I GOT THE SAME PROBLEM WITH TEMP GAUGE, BUT JUST SUGGESTION
FROM A FIEND CHECK TO MAKE SURE YOUR HOSES ARE NOT COLLAPSING AT HIGH RPM.

Posted on Jan 22, 2012

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I have a 98 Bonneville, the heater/defroster is blowing out cold air. I drove around for 30 to 40 minutes checked the radiator and it was cold to the touch. could it be the thermostat


The dash gauges are notoriously inaccurate. But it is possible that the thermostat is stuck open. Does the upper radiator hose get hot after engine warmed up? Also feel both heater hoses-when engine is warm, both should be hot-indicating the coolant is circulating through the heater core. If heater hoses are hot, and you still have cold air, the temperature blend door on the heater case may not be operating.
Try a new thermostat and see if engine warms up faster and better.

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1 Answer

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While it doesn't seem likely, if you've changed, or had the thermostat changed.... I'd say you got a faulty thermostat. I am curious as to what your temperature gauge says the temperature of the engine and coolant is.. If your gauge is showing hot, I can think of two more possibilities... the water pump isn't pumping right... and, if the water pump isn't working right, the problem can be a cracked head or block, which can cause an airlock in the coolant system. Check the coolant or radiator cap.

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1 Answer

Coolant isn't circulating in the engine of a Jeep 2002 Grand Cherokee V8. Radiator was just replaced as well as the water pump and thermostat.


Hi Jonny, While the engine is cold the thermostat will be closed, allowing coolant circulation around the engine block and cylinder head but not through the radiator. Only when the engine has reached normal operating temperature will circulation be noted in the radiator. A good test is to remove the thermostat while the engine is cold , start the engine with the radiator pressure cap removed and observe flow. If as I suspect it is there, refit the thermostat and check the heat gauge. If all remains well there is no problem. If the engine overheats replace another thermostat. If there is no circulation with the thermostat removed, there is a blockage in the cooling galleries of the engine. If chemical flushing does not clear it, it will require disassembly of the engine with careful step by step inspection at every stage. If the cylinder head(s) had been removed I would suggest making sure of the galleries not being blocked by installing the gaskets incorrectly. Regards John

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I recently replaced the heater valve on my 92 Cherokee, but the temperature still reached near the red zone after a 10 mile drive on the highway followed by an city drive of approximatly 12 blocks. Is...


Your heater control valve will only cause you problems if it leaks or fails to switch to "off" in AC mode. It will not cause the engine to run hot. (unless it leaks coolant). You did put the hoses back where they belong?
I'd replace the thermostat as they can get stuck partially open. On a 92 I'd also suspect the radiator as having excessive rust plugging part of the core. Most times flushing won't get the rust out unless it's done by a radiator shop. Normal temp should be near 210 (f). Use a 195 thermostat.

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2 Answers

1998 Jeep Grand Cherokee Engine Stays Cold


If you have verified that the dash temp gauge is correct by checking temp of coolant in radiator,yes your guess would be what i would change,the engine needs to have a 195degree thermostat in it.195 degrees is what the computer is programed to see as normal running temp.

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98 Mazda 626 overheating. Blew off hose and was


it's either a bad thermostat or a leaking head gasket

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My Jeep Cherokee 95 Radiator temperature is always hot


100 degrees f? That is way too cold Either you have the wrong thermostat or it is wide open. 180 degrees is nominal and give you the best performance.. With AC on, expect 190 to 200 degrees. We are talking farhrnheit and not ccelsius, correct?

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1 Answer

Where is the location of the coolant sensor in my 98 jeep?


There is one for the temperature(gauge,light) and also one for the fan. They are usually around the thermostat area. Follow the upper radiator hose and check the area where it is connected to engine.

Jun 13, 2009 | 1997 Jeep Grand Cherokee

1 Answer

Check gauges light comes on


Sounds like a CPU problem. your radiator may need a good flushing a s well. i would also check the heater core for any unusual problems like seal break or leakage.

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1 Answer

My 2001 Jeep Grand Cherokee's Temperature Gauge is registering HOT (check Gauges light comes on) the Jeep smells like it is running hot, but there is antifreeze in the radiator. Help me please.


You may have a stuck closed thermostat or the impeller has failed on the water pump.

Replace them both. You never trust a stat that has gotten hot, and there is no sure fire way to test. You can take it out, put the car back together and see if the engine still gets hot to determine if it's the stat, or the water pump, but once you do all that, you might as well just replace them both.

You also need to make sure the radiator is not all slugged as well, and make sure the radiator cooling fans are both working.

There is a cooling fan relay that is prone to failure as well. Mine did in my '03 Jeep Cherokee. It's located behind the right headlight, and requires that you remove the headlight, drill a hole in the plastic shield, and replacing the relay. You can get a new one at the auto parts store. For more detailed instructions, go to www.wjjeeps.com

Jan 29, 2009 | 2001 Jeep Grand Cherokee

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