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post #1 of 15 Old 05-07-2007, 10:09 AM Thread Starter
Dragnz24
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Heater core?

Yeah yeah i know summer is around the corner and i wont need my heat.
I noticed that my heater core is bypassed. There for i am thinking that it is shot. Since the weather is not going to be bad right not i figure that i might as well fix this before it does get cold again.

Has anyone replaced their own heater core and how much of pain in the arse was it. is there anything i should beaware of before i start removing dash pannels?


1991 XJ, 4.0L HO, 3in rustys coils, 3 in. block in rear soon to be replaced, on 33x12.5 , stock dana 30&35 open front and rear

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post #2 of 15 Old 05-07-2007, 12:23 PM
Parky
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I have yet to do one on the Jeep, however the two I have done (89 Mustang and and 89 VW Golf) I could swear they lowered the heater core into a room and built the vehicles around them.

I will read my Haynes and get back to you tonight.

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post #3 of 15 Old 05-07-2007, 12:26 PM
dajeepman
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Its a lot of work.. the dealer and most shops around here tells me that they have to pull the dash almost all part to get to it. Mine is 40% pluged up.
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post #4 of 15 Old 05-07-2007, 12:42 PM
KamekLocked
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Removing a dash and replacing a heater core is not as hard as most people make it out to be. It is mostly time consuming but by no means hard. I'm not sure how the XJ ones come out but don't let it scare you.

1999 Jeep Cherokee SE l 4.0 HO l AW4 l NP231
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post #5 of 15 Old 05-07-2007, 12:48 PM
spencer411
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my XJ is still under the extended warranty I got when I purchased it. and good thing I did cuz my XJ was spewing coolant into the driver and passenger side from under the dash. anyway i had my local dealer replace the core and my deductible was only 100 bucks. i forget exactly how much it actually costs to have this done, but it was pretty expensive (6 or 7 hundy i think).

when i got it back everything seemed to be working perfectly. the weather warmed up a bit and i stopped using the heater. then it got cold here again (weather in St. Louis is all over the place) and when I went to use it, my heater wasnt working at all. so now I need to call them back and see if i will have to pay my deductible again... ?

so my story doesnt really help much, but its a lengthy and expensive job. if you can or know someone that can do it, go that route. a dealer or shop will want lots of money from you if you dont.

2001 XJ Sport (silver)
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post #6 of 15 Old 05-07-2007, 02:18 PM
TwoOne
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The heater core went out on my 88 last winter, I just bought a replacement from Advance, I think it took me about 2 days all together to replace it working a couple hours each day, the main reason it took so long was because I was so bloody cold outside and I had to break every few minutes to get warmed up.

I would say if you have a chiltons manual which is what I used, and know your way around a wrench it should only take about 3 or so hours. I didn't have to remove the dash at all, just a bunch of stuff under the dash and it slid out on the passenger side. Reinstalling was the biggest pain because it takes quite a bit of effort for everything to line back up right. Take your time and watch what you're doing and it won't be that bad.

Louis
99 WJ Limited
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post #7 of 15 Old 05-07-2007, 04:23 PM
Blue XJ
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Quote:
Originally Posted by KamekLocked
Removing a dash and replacing a heater core is not as hard as most people make it out to be. It is mostly time consuming but by no means hard. I'm not sure how the XJ ones come out but don't let it scare you.
x2, it was definately not hard, just time consuming. I didn't need to remove the entire dash, I was able to unbolt the passenger side and get enough room to get the heater core out. Took about 5 hours from start to finish.

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| 4.6L Stroker | AW4 | 6.5" RK Long Arm Kit | 35" TruXus MT's | HP30, 4.56, ARB, Alloys, Lockouts | C8.25, 4.56, ARB, Alloy Shafts, Disk Brakes | Warn XD9000i | Interior Cage |
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post #8 of 15 Old 05-07-2007, 04:25 PM
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Quote:
Originally Posted by Blue XJ
x2, it was definately not hard, just time consuming. I didn't need to remove the entire dash, I was able to unbolt the passenger side and get enough room to get the heater core out. Took about 5 hours from start to finish.
I'm still waiting on you to come do mine for me...
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post #9 of 15 Old 05-07-2007, 06:34 PM
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Originally Posted by LEAD_NOT_FOLLOW
I'm still waiting on you to come do mine for me...
You've been waiting like what a year, you might waiting for just as long again.

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| 4.6L Stroker | AW4 | 6.5" RK Long Arm Kit | 35" TruXus MT's | HP30, 4.56, ARB, Alloys, Lockouts | C8.25, 4.56, ARB, Alloy Shafts, Disk Brakes | Warn XD9000i | Interior Cage |
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post #10 of 15 Old 05-07-2007, 08:21 PM
topcop38
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my understanding is the jeep is similar to the durango. i changed the one in our 99 durango and it wasn't fun. the dealer wanted like $1200 so i did it myself. no hard work but the whole dash had to come out and the AC had to be discharged then recharged. took about 16 hours from start to finish.

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post #11 of 15 Old 08-03-2007, 07:20 AM
cardana24
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So do you have to discharge your AC to change the heater core? I have coolant all over my passenger side floor board so I need to change the heater core, but I am not sure if I want to do it my self or not. My Haynes manual says you have to discharge the AC system, but I would rather not (I just charged it). I have never changed a heater core before and would appreciate some advice and how to get to it the quickest. Do I need to take the dash out? My XJ does not have any carpet so that may make things a little easier.


this is on an 85 with the 2.8 V6
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post #12 of 15 Old 08-03-2007, 10:32 AM
AZ Jeff
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Quote:
Originally Posted by cardana24
So do you have to discharge your AC to change the heater core? I have coolant all over my passenger side floor board so I need to change the heater core, but I am not sure if I want to do it my self or not. My Haynes manual says you have to discharge the AC system, but I would rather not (I just charged it). I have never changed a heater core before and would appreciate some advice and how to get to it the quickest. Do I need to take the dash out? My XJ does not have any carpet so that may make things a little easier.


this is on an 85 with the 2.8 V6
Yes, to remove the heater box, you must disconnect the AC evaporator. That, by default, means discharging the AC system.

AZ-Jeff
I don't own an XJ any longer, but I still think they are the best of all the Jeep products ever made. My XJ was my favorite vehicle in my 50+ years of driving.
So...I stick around and give advice.
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post #13 of 15 Old 08-04-2007, 02:03 PM
cardana24
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Quote:
Originally Posted by AZ Jeff
Yes, to remove the heater box, you must disconnect the AC evaporator. That, by default, means discharging the AC system.
Thanks I am working on it right now. I post back if I run into snags.
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post #14 of 15 Old 08-04-2007, 03:50 PM
collkid
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Is there anyway to test the Heater Core?

2000 Jeep Cherokee. 4.5', Long arms, Bumpers front and rear, Winch.
1992 Toyota Paseo DD 35+ MPG
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post #15 of 15 Old 08-04-2007, 06:14 PM
KamekLocked
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Pull the hoses off the heater core and run water through them with a hose, see how fast it comes out...Then you have to bleed the air out of the coolant system when you put it back together.

1999 Jeep Cherokee SE l 4.0 HO l AW4 l NP231
Dana 30/Chrysler 8.25 l 31x10.5x15 Wrangler MT/R
Flowmaster Delta 40 w/stock pipes
Optima Yellow Top l Custom Headlight Harness
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