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Old 06-20-2012, 04:00 PM   #1
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Heater Core Gaskets issues

Heater Core Gaskets issues
Yay for me!! 2 weeks ago replaced the water pump in the black TJ, Now we are doing the heater core in the 98 Sahara. This is seriously the most i have EVER done on a car in my entire life.

Between the book, and link on www.stu-offroad.com we managed to have it out and ready for the reassembly mess.

Questions/ problems:
Neither Napa Auto Parts, Oreilley Auto Parts OR THE DEALER have specific gaskets available.

(warning incoming girl lingo)
Specifically:
The big black thick spongy square "gasket" that goes around the 2 input pipes for the A/C evaporator Core.

I can get the "large formed ring" from the dealer that seals onto the black case around the blower motor. I saw online it LOOKS like this comes with with the gasket mentioned above but not sure and the dealer says thats not correct.

The other part is what the dealer is calling the Hose drain ac/ heater drain out. Its hard plastic looks like a gun holster/funnely thing. It attaches to the body/firewall center on the engine side. There is a rubber part at the bottom that looks like .. uhh a flat duck mouth thing. Mine has a small tear in it. Dealer said this part is not available. Will that small tear cause leaking? Do i need to be concerned?

The dealer then said i could use WEATHER Stripping if i cant find the gaskets - seriously?


Finally - i read to clean the air ducts and such while the whole thing is apart. Would you recommend putting in an air filter if there is one - or not because the only way to replace is going thru this hassel which honestly i never want to do again ..lol

I think thats it.. any other advice / suggestions would be welcomed.
Jeep on!

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Old 06-20-2012, 06:29 PM   #2
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Im about to do the same thing to mine - ordered some gaskets for mine.
Don't know if any others are required, but these are the only 3 I've found.
Vent seal
Seal drain to dash
Defroster duct seal

Ordered them from here

Wrangler TJ Air Conditioning and Heating Parts

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Old 06-22-2012, 04:28 PM   #3
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UPDATE:

So after numerous calls, and trips to various auto parts store I learned that the purpose of that gasket is for vibration. It doesnt actually seal anything.

The link mentioned above was the cheapest and would provide nearly all the "gaskets" i needed for about $80 and a week's wait time.

Instead - i follwed the advice given by 2 mechanics and fixed it for under $10, using High Temp RTV silicone "gasket" maker (red). I got mine at the hardware store.

Carefully removed the old gaskets with a razor blade. In some cases the gaskets were torn in various places trying to remove the heater core.

Wash the foam gaskets in water carefully - several of mine were soaked in some type of fluid (antifreeze mostly). Squeeze out execess water and dry. I then used shop vac - but it dried in sun in about 10 mins while working on some of the other gaskets.


Using the RTV - piece back as much of the torn gaskets as possible. Let cure for about 30 mins.


Use the RTV to "glue" the gaskets/ foam to where they need to stick. Again give it time to cure. And you are good to go!


In a few cases some of the gaskets simply disinigrated. I picked up (free) from the auto parts store some stiff white packing foam used in bottoms of some display boxes. I was able to easily make my own "gasket" using an xacto knife. I coated it in the RTV to just be safe, then "glued" into place using the same red RTV silicone.


Whole process took less than an hour - with about 20 additional mins to let dry.

Happy Jeepin!
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Old 06-22-2012, 04:39 PM   #4
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Quote:
Originally Posted by Sonoma_Girl View Post
Heater Core Gaskets issues
The other part is what the dealer is calling the Hose drain ac/ heater drain out. Its hard plastic looks like a gun holster/funnely thing. It attaches to the body/firewall center on the engine side. There is a rubber part at the bottom that looks like .. uhh a flat duck mouth thing. Mine has a small tear in it. Dealer said this part is not available. Will that small tear cause leaking? Do i need to be concerned?
Did you get this part fixed or replaced? If still pending, you can probably repair it with JB Weld or something similar. I rebuilt an entire air dam under the front of my Dakota with JB Weld after an encounter with a big chunk of hard frozen snow on the road.
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Old 07-05-2012, 02:42 AM   #5
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My boyfriend and I replaced the heater core ourselves - the gasket i repaired using the method suggested and mentioned above.

UPDATE on the gasket:
We took the Jeep on a run to Arizona and ran some trails in sedona. We went sloshing through a creek and dirty WATER started dripping inside where we did the heater core (passenger side floor mat). My assumption is that the "fix" on the gasket was probably not the smartest given the hassel of having to pull the heater core.

Having gone through it and now stuck with the "results"
Suck it up and spend the $110 to get new gaskets - at this point to replace them i have to pull the heater core again!!
blah.
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Old 07-05-2012, 07:00 AM   #6
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Before you pull it out again go to a Parts Store & ask for some "A/C Expansion Valve Tape" It's about 1.5" wide & 1/8" thick you should be able to wrap/mold it around the leaking part (Likely the a/c drain tube) be sure to pull the protective tape off the sticky side,It's called tape but it is kinda a gooey type sealant,I know NAPA Carrys it but it does come in a fairly large roll,Any Auto a/c place should have it & may give sell you a few feet of it,If you have to pull it out again sometimes gaskets can be made with the foam stuff that they sell that goes between a pickup camper & truck bed but it's only 1.5 to 2" wide.

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