Question about Jeep Grand Cherokee

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1999 jeep cherokee . overheating and no heat!!!!

Used leak sealer, liquid glass

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  • Philip Keith Randall Nov 08, 2012

    yes ty for your suggestions , simply put their is some blockage in the radiator flow and i have no heat . is the heater core causing this overheating and no heat ( BLOWING COLD) could this cause be the thermosttat?????


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  • Jeep Master
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Replace the thermostat and bleed the air from the cooling system, then if it still overheats you may have a leaking cylinder head gasket. Any shop can detect the leakage with a gas analyzer by looking for the presence of combustion gases in the cooling system.

Posted on Nov 08, 2012

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Check and top up the level of coolant in the radiator and the overflow tank. The heater core would not cause overheating. The thermostat could, but only if struck closed.
Either test your thermostat in a pot of boiling water (it should open just before the water starts to boil) or try a new thermostat.
You said a blockage? Do you suspect the radiator is not flowing good, or a circulation problem in general? When it overheats, feel the radiator hoses. If the thermostat is opening, the upper hose will be hot, and if the radiator is flowing good, the lower hose will also be hot.. If you suspect the radiator is blocked, you can take it off and clean the outside of leaves and dirt, turn it upside down and put a garden hose in it and reverse flush it.. (My son's jeep had a leaky radiator. Cost of a new one was $127, which I thought not bad.) If your radiator is not blocked, suspect a water pump problem or have the block test done to check for a blown head gasket.
Good luck.

Posted on Nov 08, 2012

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Posted on Jan 02, 2017

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SOURCE: my jeep grand cherokee started overheating at idle

try the water pump - first - make sure the radiator is really full - take the cap off cold and fill - if it looks full - start and run 8 minutes or so - then fill it up - look at ur fan belt - is it tight - tight is about how much pressure u use to make a firm hand shake with little movement - any movement over about an inch is loose - when the jeep warms up the belt can slip and not even make a noise - - new materials don't always squeal. - then be sure ur water pump is ok - they go slowing - the fins wear down - one more thing is the radiator - u don't say how many miles or what maintenance schedules you have or not so that's it for now

Posted on Dec 26, 2009

  • 159 Answers

SOURCE: My 99 Jeep cherokee laredo keeps overheating

the reason it getting hot when stopped is the fan relay is out thus not turning the cooling fan on,this is a time consuming job,the relay is located on the passenger side tip of the frame behind the headlight,the grill,headlights,bumper,and tip of the front fender has to be loosened up to get to it.
The relay is about 70.00 or so,the engine cools down when you drive as you are forcing air through the radiator to cool it down,as for the heater issue probably caused by boiling the anti freeze out ,
To make sure the engine is ok do a compression check to verify the headgasket and heads are ok,as for smelling the sweet smell which is antifreeze probably due to overheating and pushing the fluid out of the cap or tank.

Posted on Dec 30, 2008

  • 57 Answers

SOURCE: 1999 jeep grand cherokee laredo 4.0 litre

OK here we go you will need a test light for the following tests, i will try to be as descriptive as possible so lets get started

fist start the engine and turn on the a/c that should command the fan on.
right front engine compartment next to the battery is the power distribution center pop off the top, ground your test light to the negative battery terminal and find fuse number 10 it is a 40 amp fuse check both sides of this fuse with your test light, if you have power on both sides of the fuse than we shall go further.

unplug the connector from the cooling fan, there should be two wires in the plug one is dark green and the other is black with a pink tracer, with your test lite grounded to the negative battery terminal check the dark green wire for power, if there is power there than move your test light ground clamp to the battery positive terminal and test the black wire for ground,
if testing the black wire made the test light shine than the ground circuit is good, if it did not than check you ground connection behind the right headlight.
when testing the dark green wire, if the dark green wire made the test light shine and the ground circuit is good than you simply have a bad coolant fan motor.

I suspect you were not getting power to the fan motor so you will need to take a look at the radiator fan relay, this is a special solid state relay mounted to the inside of radiator core support on the right side down behind the bumper.

here you will find a single plug with 4 wires in it

black = ground
dark blue / pink = relay controll from pcm
dark green = output to radiator cooling fan
gray = battery power from fuse # 10 in pdc

unplug the relay ground your test light to the battery negative terminal, with the engine running and a/c turned on check the gray wire the test light, it should turn on if not recheck fuses.

move your test light to the battery posistive terminal and test the dark blue / pink wire, if the test light turns on than you have a bad radiator fan relay, you can pick one up at your local parts store for about $85.00 just make sure you get a high quality one the cheap ones have a hard time with the amprege consumption of that fan.

good luck


Posted on Jun 14, 2009

  • 37 Answers

SOURCE: 1999 Jeep Grand Cherokee - the blower works but

does the air blows only on the windshield? if so there is a sensor located inside your dash board that need to be replace. Go to MSN.Auto and type in your vehicle under used cars and check the reliabilty it will tell you this and more.

Posted on Aug 29, 2009

  • 5081 Answers

SOURCE: shift indicator light 1999 Jeep Grand Cherokee

There are two parts to it, a voltage resistor, and the EL panel itself.

You need to remove the console first. There are 2 screws under the front rubber pad, two under the cup holder, two in the bin. Remove those six first, take the storage bin out, then slide the rear cupholder out, remove the two screws under the cup holder, and one in front of it.

There are a total of 6 flat screws, and 3 self tapping screws you have removed.

Put the parking brake on, shift the tranny to N, and the transfer case to the middle position if equipped.

Remove the entire console. Slide the shifter beezel as far up vertically as you can. There are 4 clips you ned to remove to do it.
You will see a blue and black wire running into the back. Follow those wires to the resistor. You will see a transparent EL panel attatched to the resistor by two clips.

Usually, one or both of these clips has come loose, causing the light to work intermittantly. Clip them back on, and turn on the headlights to confirm that the light works correctly now.

Re-install everything in the opposite order.

Posted on Oct 11, 2009

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When i turn on the heat, I smell antifreeze right away then it goes away

Your heater core is leaking. The heater core on your 2001 Jeep Cherokee is responsible for providing heat in the cab of your Jeep. Overtime, he heater core can become plugged with dust or corrosion and stop working causing it to leak. The heater core is linked with the antifreeze that runs in the radiator in turn draws heat from the engine and than uses that heat to warm up the car. Most heater cores are located under the dash on the passenger side. Here is a link for how locate and remove the heater core.

Good luck! :)

Nov 02, 2010 | 2001 Jeep Grand Cherokee

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Anti freeze leaks slow out the bottom can I put a liquid seal repair to fix it .

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Dont get heat

maybe the flow thru the internal matrix is poor due to the water pump being on its way out? Or you could have a small leak that is causing the water to boil under normal driving, have you got any loss of coolant or overheating in the engine - even slight?

Also is there a valve controlling flow thru the core, as some cars have a shutoff valve that may be stuck, should be electrical but may be cable operated on yours as its a 4wd jeep etc.

Jan 15, 2010 | 1999 Jeep Grand Cherokee

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1999 Jeep Grand Cherokee overheated

You probably messed up a rod or caused piston damage your going to need more than a head gasket usauly when you over heat a car you causing the pistonts to expand more then they need to causing scouring and exsisive piston ware by the sound of it and the year your better off replacing the whole motor or completely rebuilding the old one wich will cost more then a use motor! good luck!

Sep 12, 2009 | 1999 Jeep Grand Cherokee

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