My ACTUAL Evaporator:Heater Core Removal:Installation Thread..... - JeepForum.com

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08-11-2008, 12:50 AM #1

xjguy98Registered User

1998 XJ Cherokee Join Date: Sep 2005Location: Belleville, OntarioPosts: 553 Profile Gallery Classifieds My Jeeps

My ACTUAL Evaporator/Heater Core Removal/Installation Thread.....

Seeing as how this is a pretty common snag with our Jeeps, I figured I'd add to the list write-upson how to do it. Lots of pics so sit back and read on

The first thing I did was disconnect the negative battery terminal. A) because you'll have yourdoors open and courtesy lights on for a LONG time and B) so your airbags don't go off whenyou're in the middle of removing the dash.......don't be lazy...DO THIS NOW. After that and whileyou're waiting for the capacitors to discharge and for your airbags to be safe, go ahead and startremoving the following:

1) Both front seats (makes access to everything much easier)2) Both lower a-pillar trim panels (or kick panels, whatever you call them)3) The lower steering column cover/metal knee blocker

4) Remove the center bezel that covers up your stereo/heater controls/switch panel5) Remove your headlamp knob by reaching up and pressing the release button on the inboardside of the headlamp switch. The knob should just slide out.6) If you have tilt steering, set it to the lowest position and disconnect the rubber steering columnsurround.

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7) Remove the instrument cluster bezel (held in by snaps and four screws)8) Pry the rear edge of the top cover up to disengage the seven snaps.9) Once clear, pull the entire top cover rearward and disengage the remaining four snaps.10) Remove your shift knob (it helps if it's in 1-2, sit in the back seat, brace yourself and give it agood pull and it should come off. Don't punch yourself in the face while doing this)11) Remove the shifter and transfer case bezels and unplug the light bulbs.12) At this point, you can remove the two screws holding the front of the center console down.Open the console and remove the remaining two screws and the console should be able to beremoved. It might take a bit of finessing to get around the parking brake handle though so becareful.13) Pull the carpet (if you have carpet) back far enough so you can see the two lower nuts holdingthe panel center support bracket to the tranny tunnel.

14) Remove the two lower nuts and the two upper nuts and remove the bracket from the vehicle.15) At this point in the FSM, it tells you to remove the steering column. From everything I'veread, you don't HAVE to but I did. It was a pain and the next time I do this, I'll unbolt it from thebracket but I'll leave it in. You only need to be able to swing the dash out enough to access andremove the HVAC box from the firewall. Anyway....here's how to remove the column if you're soinclined.16) I removed the airbag...don't know why...


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17) You can pull the steering wheel off the column. I didn't because one of the holes for the pullerwas stripped so I left it.18) Remove the lower shroud

19) And upper shroud


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20) Unbolt the steering column coupler bolt from the intermediate shaft. You may need to turn thewheel in order to access it.21) Disconnect all the electrical connectors associated with the steering column as well as thebrake park interlock switch from the ignition cylinder. I removed the ignition cylinder as well butyou may not need to. The interlock switch just clips in to the righthand side and drops away.22) Remove the two vertical mounting nuts and the two horizontal mounting nuts from thesteering column and support it as you lower it off the bracket. You can now pull the column out ofthe dash. Here's the dash with the column removed, the wiring harness on the left and theinterlock switch and solenoid on the right

Here's a view of the mounting studs and coupler for the steering column:


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23) Remove the bolts from and disconnect the two big electrical connectors under the lefthandside of the dash. The rearmost one should be the gray one and the forward one should be thewhite one. I had trouble with the white on and left it hooked up so I couldn't COMPLETELY removethe dash. No pics of these because I was pissed off24) Just to the left of the tunnel and under the dash as well is another big grey electricalconnector. Remove the bolt and disconnect this, as well as the small yellow airbag connector thatshould be around the middle of the under-dash area.25) At this point, you can switch sides and roll down the glove box. There's two rubber stoppersand if you remove them, the glove box will rotate clear allowing you to gain access to the rear ofthe HVAC box.26) On the lefthand side of the glovebox opening, you should see the white vacuum connector.Disconnect the two halves. Also, you should see a big green connector for the blower motor.Disconnect this as well.27) Reach under the righthand side by the fuse panel and disconnect the two halves of theantenna cable.28) You can go two different ways with this next step. I tried the by-th-book method and it didn'twork so I improvised. The book says the remove the temperature control cable from the HVACbox by unscrewing the blend-air door bellcrank from the door shaft underneath the dash. Icouldn't get it unscrewed so I removed the heater control panel, separated the cable from thecontrol head and routed it clear of the dash itself so it hung clear and out of the way. You can dowhatever is easiest for you.29) Loosen the left and right dash roll-down screws about 1/4" They're located right next to eachcourtesy lamp so they're easy to find.30) Remove the four bolts that secure the upper-forward edge of the dash to the firewall. Thereare two on the left and two on the right.31) After the bolts are out, remove the two nuts (upper forward edge) holding the center of thedash to the firewall. The dash won't fall away with these removed as the studs are still holding itin.32) With some help (I did it alone and it was a struggle for me) lift the dash up off the two centerstuds and then pull it backwards to clear the roll-down bolts. Your dash area should now(hopefully) resemble this:


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At the left of the picture above, you can see one of the big gray body connectors.

At the center of the above picture, you can see the temp control cable, as well as the greenblower motor connector and the vacuum connector.

With my dash swung out of the way due to that stubborn connector on the lefthand side....it's amess but it looks worse than it actually was.


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NOW, hopefully nothing was left connected and your dash should be out of the vehicle. If youforgot anything (or I forgot to mention anything) now's the time to disconnect or remove it. Ifound that bagging and labelling EVERYTHING (no matter how small) REALLY helped when I puteverything back together. Grab a box for the parts bags and set aside a small corner for thebigger parts. The more organized you are, the easier the job will go for you because it's easy tomisplace/lose things.

Anyways....on with the HVAC box. The FSM says to drain the coolant but you don't need to. Justmake sure you have a small bucket or tupperware container to catch the small amount of fluidthat will drain from the heater hoses as you disconnect them from the heater core.

1) MAKE SURE IF YOU HAVE REFRIGERANT THAT IT'S EVACUATED BY A PROPER SHOP. DON'TOPEN LINES AND LET IT ESCAPE....IT'S AGAINST THE LAW AND BAD FOR THE ENVIRONMENT.There I said it...2) Using an A/C line disconnect tool (I paid $14 for my set at the parts store) disconnect the liquidline from the evaporator inlet and the accumulator from the evaporator outlet. Mine have neverbeen done so they took about 20 minutes for both but they came out. Make sure you cover thelines somehow. I used a couple of bags with zip ties to keep crud out. The less contamination thebetter.

TO BE CONTINUED...

__________________[SIZE="1"][CENTER]'98 XJ Sport, 4.0L, AW4, NP231, HP30/8.25"3.5" RE Superflex, Full Leafs, OME's All Around, JKS Trackbar31x10.5R15 Mickey Thompson Baja MTZ's on 15x8 Rockcrawler's (3.75" BS)C4x4 Front Tow Hooks/Rear Hidden Hitch[/CENTER][/SIZE]

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08-11-2008, 12:53 AM #2



Here you can see bags over both the accumulator and liquid lines.

3) I was replacing the accumulator as well so after I disconnected it, I removed the old one andtransferred the low pressure switch over to the new one.4) Disconnect both heater hoses from the heater core (using a bucket to catch the drips) Icouldn't get mine removed so I disconnected them from the other end, fed them through thefirewall and reconnected them to the engine afterwards.

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5) Between the evaporator tubes and heater core tubes, you'll see a small vacuum hose.Disconnect it from the tee-fitting.6) This is the biggest pain I found for this entire job. Removing the five mounting nuts. You'll findone just outboard of the blower motor. The next two are holding the accumulator mountingbracket to the firewall. The next one is just to the right of the engine centerline and above thevalve cover (on the firewall, looking forward) and the WORST is about 6" below it behind thecylinder head. I was able to use a 7/16" socket for the first four but the bottom one I had to use along box end wrench and turn it a little at a time. Be very careful not to drop it as it'll end up onthe bellhousing and you'll never get it back.

Here you can see two of the five mounting points as well as the tee fitting for the vaccum line (topright):

7) After you are able to remove the five mounting nuts, go back inside and gently pull the entireHVAC box rearward to clear the studs/drain hose from the firewall. This is what you should end upwith:


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Almost there....

Gone....


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08-11-2008, 12:57 AM #3



Now it's time to break the box down and actually do what we set out to do. Replace theevaporator or heater core.

1) Unplug the vaccum lines from the floor door actuator on the lower left side of the box as well asunplug the vaccum line from the recirc door actuator on the right side.

Floor Door Actuator:

Recirc Door Actuator:


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2) Disengage any vaccum line from any clips on the lower half of the housing.3) Disengage the blower motor harness and relay from their holes in the upper half of thehousing:

4) Unplug and remove the blower motor from the housing


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5) Remove the foam seals from the blower motor surround and the evap/heater tube surround. Ibought new seals ($60) so I didn't care what the old ones turned out like but I'm sure withpatience, a heat gun and a scraper you could salvage both.

6) Pop off the two snap clips on the left forward side of the housing and remove the 14 screwssecuring the two halves.7) After making sure everything is disconnected/removed, carefully lift the top half off the bottomhalf. It might take a bit of coaxing but it should come off easily enough. Set the top half aside.

This is what I was left with. Looking down on the bottom half of the housing:


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And this chunk of foam is what sat under the evaporator....nicely rotted away


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8) After the two halves are apart, simply lift the old evaporator and heater core out of thehousing. When replacing either or both of these, all the foam rubber seals need to be transferredover to the new part. Be careful when taking them off because I don't know of any part numbersfor them.__________________[SIZE="1"][CENTER]'98 XJ Sport, 4.0L, AW4, NP231, HP30/8.25"3.5" RE Superflex, Full Leafs, OME's All Around, JKS Trackbar31x10.5R15 Mickey Thompson Baja MTZ's on 15x8 Rockcrawler's (3.75" BS)C4x4 Front Tow Hooks/Rear Hidden Hitch[/CENTER][/SIZE]

08-11-2008, 12:59 AM #4



Ye Olde Evap Core:


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Ye Olde Heater Core (still works though)


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New heater core installed with foam (I used spray adhesive to stick the foam on the new cores)


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New Evaporator installed:


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08-11-2008, 01:02 AM #5



For installation, just reverse everything you saw above. I used RTV sealant when I reinstalled theblower motor just to make sure it never leaked again.

New foam seals installed on the HVAC box:


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HVAC box reinstalled:


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New accumulator installed:


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08-11-2008, 01:04 AM #6



When replacing the evaporator, be sure and add 2oz. of PAG100 oil to it before you sealeverything up. With the accumulator, I added 4oz.

After the HVAC box is installed and hooked up, simply re-install the dash. I used EricsXJ's ideaabout adding adhesive felt to all the points where I thought two trim pieces would make contactjust to tighten/dampen any contact and reduce noise. Driving the Jeep around today it seemed alot less prone to those "cracks" that are common with our Jeeps. It took a bit more time to do allthat but I think it was worth it. When are you gonna have your dash out again right?

Once you have everything semi-installed and connected, start the Jeep up and check for anyproblems. My heater core leaked so I need to pull everything apart again and sort that out. Aswell, my turn signals for some reason don't wanna work but I think it was related to all the pullingand tugging I did with that one connector on the left side. Check your lights, stereo, heatercontrols, steering (if you removed the steering column) gauge cluster...everything. If somethingdoesn't work, fix it. After you have EVERYTHING working and buttoned up, get the A/C systemevacuated again and recharged. Get them to leak check it and if there are leaks, well, get themfixed. I'm not at this stage yet but hopefully in a few days I can sort out the heater core and havemy A/C back and blowing cold again.

If anyone has any problems or questions about how to do this, feel free to PM me and I'll get backto you as quick as I can. It's a daunting task to be sure but once you've done it once, it's not sobad.__________________[SIZE="1"][CENTER]'98 XJ Sport, 4.0L, AW4, NP231, HP30/8.25"3.5" RE Superflex, Full Leafs, OME's All Around, JKS Trackbar31x10.5R15 Mickey Thompson Baja MTZ's on 15x8 Rockcrawler's (3.75" BS)C4x4 Front Tow Hooks/Rear Hidden Hitch[/CENTER][/SIZE]

08-11-2008, 08:38 AM #7

Tigger3258Registered User Join Date: Mar 2006Posts: 14 Profile

evap write up

Man, why couldn't you have posted this 2 weeks ago. My dad and I did this project on my 01 xj. Itied a string around my wrist so I didn't loose my wrench while trying to get the nut off thefirewall. Our biggest pain in the rear was the factory broke off the weldnut for the roll down screw.


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Gallery Classifieds My Jeeps

They used some type of strange adhesive to hold it in. Took us two hours to get the dang dashloose from this adhesive. We did not take out the steering colum, just pulled away the dash on thepassengers side. We had something caught up on the drivers side so the dash stayed in. Thanksfor doing a write up!

08-11-2008, 10:53 AM #8



Quote:

Originally Posted by Tigger3258 Man, why couldn't you have posted this 2 weeks ago. My dad and I did this project on my01 xj. I tied a string around my wrist so I didn't loose my wrench while trying to get thenut off the firewall. Our biggest pain in the rear was the factory broke off the weldnut forthe roll down screw. They used some type of strange adhesive to hold it in. Took us twohours to get the dang dash loose from this adhesive. We did not take out the steeringcolum, just pulled away the dash on the passengers side. We had something caught up onthe drivers side so the dash stayed in. Thanks for doing a write up!

I think I may have read one of your previous posts about the broken weld-nut so when the timecame to loosen those two bolts all I could think of was "don't effin break..." but they held andweren't covered with any goop....I figure it's such a common thing and there isn't an actual writeup on it so I figured why not__________________[SIZE="1"][CENTER]'98 XJ Sport, 4.0L, AW4, NP231, HP30/8.25"3.5" RE Superflex, Full Leafs, OME's All Around, JKS Trackbar31x10.5R15 Mickey Thompson Baja MTZ's on 15x8 Rockcrawler's (3.75" BS)C4x4 Front Tow Hooks/Rear Hidden Hitch[/CENTER][/SIZE]

08-11-2008, 11:18 AM #9

PacepaperboyRegistered User

2001 XJ Cherokee Join Date: Jan 2008Location: AtlantaPosts: 48 Profile Gallery Classifieds My Jeeps

Will be doing this in a week, thanks a bunch.

08-12-2008, 08:47 PM #10

Cheese1Registered User Join Date: Jun 2007Location: OhioPosts: 11 Profile Gallery Classifieds My Jeeps

This is the BEST write-up ive seen......when taking the cover off the instrument cluster there is abutton on the light switch that can be pushed in to remove the knob and shaft from the switchitself. This will make you very happy when you put it back together. $1000 saved.....now that Ivedone one, bring em on. Its not real hard just time consuming and makes you cuss your a-- off.

Again Great write-up

08-12-2008, 09:01 PM #11

EagleStormRegistered User

2008 WK Join Date: Jun 2008Location: UtahPosts: 272 Profile Gallery Classifieds My Jeeps

Good job you may regret sealing the blower motor with rtv if you ever have to replace it . unlessyou let it dry before you installed it If you used the factory clamps on the heater core I would tossthem and use new screw clamps. I have made that mistake before and they leaked and made itlook like the core was leaking.But it was the hose clamps and the coolant ran back into the carbehind the carpet Great write up good pic's

08-12-2008, 10:57 PM #12


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funinmudRegistered User

1998 XJ Cherokee Join Date: Dec 2007Location: Tucson, AZPosts: 876 Profile Gallery Classifieds My Jeeps

Stickify It!!!__________________-James

98 XJ on 32's and 2-3" lift, locked, armored, and ready to rock.

08-12-2008, 11:04 PM #13



Quote:

Originally Posted by EagleStorm Good job you may regret sealing the blower motor with rtv if you ever have to replace it .unless you let it dry before you installed it If you used the factory clamps on the heatercore I would toss them and use new screw clamps. I have made that mistake before andthey leaked and made it look like the core was leaking.But it was the hose clamps and thecoolant ran back into the car behind the carpet Great write up good pic's

Seeing as how I have to go back in and rip it all apart again......I'm ALREADY regretting RTV'ingthe blower motor. Seemed good in theory but in practice, at least right now, might not have beenthe best idea I've read a few people that suggested it might be the old hose clamp. I bought abunch of new hose clamps for when I bypassed the heater core the other day so I might hookeverything back up with the "new" clamps and try it again. I REALLY don't wanna rip everythingapart again if I can get away with it....__________________[SIZE="1"][CENTER]'98 XJ Sport, 4.0L, AW4, NP231, HP30/8.25"3.5" RE Superflex, Full Leafs, OME's All Around, JKS Trackbar31x10.5R15 Mickey Thompson Baja MTZ's on 15x8 Rockcrawler's (3.75" BS)C4x4 Front Tow Hooks/Rear Hidden Hitch[/CENTER][/SIZE]

08-26-2008, 07:51 PM #14

Cheese1Registered User Join Date: Jun 2007Location: OhioPosts: 11 Profile Gallery Classifieds My Jeeps

So did you salvage it or did you have to go back in I hope not as I know how much this jobsucks....but on the other hand the more you do it the better you get at it

08-26-2008, 08:20 PM #15

Bob-ERegistered User

1998 XJ Cherokee Join Date: Mar 2008Location: Canonsburg, PAPosts: 52 Profile Gallery Classifieds My Jeeps

Holey Crap!! I can't beleive that you would have to rip the entire dash out just to replace a heatercore. What a pain in the A$$.

Nice write-up though!

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