Having problems with your Jeep Grand Cherokee ?

I need to replace my heater core i need step by step directions on remove and install new. jeep grand cherokee laredo 2002

Posted / edited by AnonymousUser on : 19-03-2018

Answers :

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.
Repair Help & Product Troubleshooting for Jeep Grand Cherokee

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