Question about 1999 Jeep Grand Cherokee

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How do I replace the heater core on 1999 Jeep Grand Cherokee Laredo

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If u are not a mechanic dont even try! the dash comes off the the climet control box comes offf then you open the box tahe out the heater core replace it .

Posted on Dec 01, 2012

  • techwiz_wall
    techwiz_wall Dec 01, 2012

    My mechanic wants to know step by step hoe to get to it and replace it. He does not have a chrysler manual and I have seen the video on You tube. He on the other hand is old scholl and needs t wrtten down, Can you please tell me step by step of how to locate it and he can go from there. I on the other hand just need to know ihow long it will tak if you care to share that. Thank you.

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Posted on Jan 02, 2017

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sourav007
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SOURCE: i need help with heater core replacement for my

Changing the heater core requires complete removal of the dash panel and plenum box. To do this you have to remove the steering wheel, steering column, evacuate and recharge the refrigerant system and drain the radiator. I would only consider changing the heater core if it is physically leaking into the passenger compartment. If the problem is heat transfer to the HVAC system only, the problem is more likely with the blend doors. Check heatertreater.net for pictures and diagnostic information.

Posted on Jan 10, 2010

  • 593 Answers

SOURCE: Heater Core in Jeep Grand Cherokee 1999

Unfortunatly, those are the classic symtoms of a bad
heater core. But just to be sure, check the heater hoses at the firewall and make sure that a loose clamp is not allowing coolant to spray into the car.
I don,t know what the part costs, you can find that out by calling autozone/napa or any parts store.
But there probably will be a slight markup by who ever is to do the job. As for the labor, the book allows
5.9 hours for the job. This will give you a place to
start when you check around for the best price.
If you have a mechanic that you use often(and trust)
ask him/her what it will cost. It's not strictly dealer.
Hope this helps.

Posted on Feb 28, 2010

  • 1509 Answers

SOURCE: i need to replace my

Still need to know which engine you have as the 4.0 and the 4.7 V8 are all different animals. the 4.7 is a Mercedes Design and the 4.0 is a american motors design . their all different. The 5.2 is the most common engine.is the 4.0 inline 6. the procedure is about the same for both. the flat rate manual allows for 6 hours to do the work. I have done the job a few times and I'm a chysler dealer mechanic. I take all day as the airconditioner needs to be recharged too and it's best to change the evaprator core while your in there as it fails more often than the heater core and if we're after the evaporater core we change the heater core as the labor job is the same. The first step is to remove the entire heater box from the car which requires removal of the steering collum and the dashboard assembly. The combination of things that need to be done requires you to be a master mechanic, as you get intoo all the systems of the car to complete the repair work. On a scale of 1-10 this is a 8 as for difficultly and theirs plenty of times you need a second person to hold and staey things and line things up. I remove the front seats too and if your a big guy you have too. I recomend that you spend the money at the local auto parts store for the car as thiers lots of hiddin bolts and safty precautions that had better be followed or your breackage rate of parts will be higher than if you paid the highest place in town thier highest rate and you'll still be working a very diffacult job. I expect that you local garage thart does this kind of work, ( dealer, Raditior shop, full line, auto service shop, some tire stores ( not all)) and even some of them don't have the mechanic that can do this work right. Your evacuating the air conditioning system and removing the lines and the epatorater blcokes, after that your draining the cooling system and removing the lines from the firewall and you'll need to be careful as the heater box is easy to damage. disconnect the two vacume harnesse that are under the hood these operations are best done with the hood removed. and with the hood out of the way it's easier to et the box back in when your ready to put the repaired bax back in the car. with the ateering collum disconnected from the bottom of the dash and set it in the front seat and the passengers seat removed from the car. remove all the bolts holding the dash in and pull it up and out. the instrument cluster has to be removed as do the heater controls and the radio just so you can get to all the bolts that hold the dash in, Disconnect the main wire harnesses and thwith the air bags removed the dash can be removed from the car.. on the engine side of the firewall theres 6 studs sticking though with nuts on them remove the nuts and the condesate drain hose. on the interior side pull back the carpet and remove the bolts holding the top and the bottom of the heater box to the friewall. slowly with a helper remove the heater box and watch for wires and hoses that you may have missed while you wer unhooking everthing, anything you don't wthink you'll remember how it goes you'll need to take pictures draw scheches and tag and number so you can put it back right. Remove the heater box and put it on your workbench being carefull not to drop it or break the little motors theat run the air doors the heater core comes out of the top of the box and the heater tubes are sucured to the heater core with brackets and they fit in the core it'self with O ring seals. put a little sealing grease on the O rings as you go back to gether and get the cre set in the box with the tubes hooked up and pressure test it for leakss before puting the heater box back in the car ( theirs nothing like having to do this job twice.) Change the evapater too as you don't want to do this job again soon, it comes out like the heater core only the tubes are made onto the core. With the box assembled and your helper ready put the box in and connect as many wires as you can as it goes in as there easier to connect with a litle room.. Hold the box carefully as a third person needs to be on the engine side to make sure to guild the pipes though the firewall and direct you to raise or lower the uhit to alline all the bots to thier hols as forcing anything may break the connection between the core and the hears pipes and your back to the beginning. as soon as the box is bolted up again pressure testr for leaks as it's bad to have to find out after you've put ht e dash all back in. connected the heater hoses and again test the whole cooling system. fill it and al. and test again as the teardawn if you have to is four hours shorter if you have to go back and do it over now. reinstall the dash and all the wiring and as it goes together its easier to aline the ducts as it goes to gether than to try to force then in later. connect the lines to the airconditioner and charge the AC unit and with everything hooked up run the car with the hood still out and the steering down and the seat still out checking for leaks. ( i've done this job 3 times after someone broke something doing it wrong the first time. I charge more too.) If your the master mechanic that yu need to be to do this job I don't know why your asking the way to do it on here. Shop around and if you can get a done job for less than $500 and they;ll warrentee all the systems disturbed to work correctly ( heating airconditioning steering seats hood radio all dash gauges shift indicator transmission function wipers turnsignals and all the other lights and the check engine light won't be on, go for it ) I've heard of this job going with extras at over $1000. If your not an experienced mechanic with a good experienced helper then you'll save money paying to have the job done.

Posted on Oct 15, 2010

  • 6982 Answers

SOURCE: Heater core replacement, 2000 Jeep Grand Cherokee

you need to evacuate the freon because in order to get the heater core out you also need to remove the evaporator for the AC. (great design huh?)

Posted on Nov 02, 2010

  • 2309 Answers

SOURCE: I have a bad heater core on a 1999 Jeep Grand

sorry to burst you bubble, they are no fun to do, just make a note of every thing you disconnect and where it goes

Posted on Dec 18, 2010

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Need to replace the heater core for my jeep grand cherokee laredo


Look this up on Youtube so you can see step by step how to do it. Very involved it requires removal of the dash.

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1 Answer

How to replace the heater cord on a 1999 jeep Cherokee?


You must remove the instrument panel and the A/C-heater housing to replace a heater core on a Jeep Cherokee.

I would be happy to provide complete instructions as well as diagrams if yu would like to take tis project on yourself.

Just click on my profile picture below and go to my FixYa profile page. Click the tab that says "Pro Services". When the page opens up, click any of the services listed. (It doesn't really matter which one - they will ALL connect you with me) Sign up for Email support. Be sure to include the Year, Make, Model, Engine Size, and a brief description of what we are trying to fix in your message (just so I don't mix you up with someone else). Youi can also do this by clicking any of my ads that you may see on FixYa.

Be sure to mention WHICH 1999 Cherokee you have...Cherokee Laredo, Grand Cherokee, Grand Cherokee Limited, etc. I would also need to know if you have MANUAL heating and air conditioning or if your vehicle is equipped with AUTOMATIC climate control.

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1 Answer

I have a jeep grand cherokee laredo that the heat is not very hot, and the air that comes out of the vents is not the same throughout. how can i fix that?


Sounds like the heater core is dirty, take the fan motor out and reach inside the air vent, you can feel the heater core (scratch your finger nails on it), is there a bunch of debri on it, I found this to be a problem when there is a leaking heater core, (coolant leaks onto the core and dust and dirt attaches to it restricting air flow and reducing heat. Also you might want to flush the entire system and replace the coolant.
Please rate your mechanic.

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1 Answer

Heater core replacement, 2000 Jeep Grand Cherokee Laredo. Why do I have to evacuate the freon?


you need to evacuate the freon because in order to get the heater core out you also need to remove the evaporator for the AC. (great design huh?)

Nov 02, 2010 | 2000 Jeep Grand Cherokee

1 Answer

I need help with heater core replacement for my 1999 jeep grand cherokee laredo


Changing the heater core requires complete removal of the dash panel and plenum box. To do this you have to remove the steering wheel, steering column, evacuate and recharge the refrigerant system and drain the radiator. I would only consider changing the heater core if it is physically leaking into the passenger compartment. If the problem is heat transfer to the HVAC system only, the problem is more likely with the blend doors. Check heatertreater.net for pictures and diagnostic information.

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1 Answer

Heater problem


it could be that the heater is air locked. joe

Nov 21, 2008 | 1999 Jeep Grand Cherokee

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