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Old 03-18-2013, 04:34 PM   #1
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Heater core ?

I am starting to smell radiator fluid on the inside of my jeep. ( 2002 4.0 with air) I cannot see any visible leaks on the floors , is there something else i should check before i go after the heater core?.

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Old 03-18-2013, 04:36 PM   #2
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Check the HVAC/ evaporator drain tube. It's in the engine compartment, on the firewall, below the battery. It's a 90 degree rubber tube sticking out. That's where the majority of the external leakage was on mine. It'll drip down onto the frame rail just in front of the control arm bracket.

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Old 03-18-2013, 04:37 PM   #3
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If you're smelling coolant inside the Jeep, it almost has to be a leaking heater core.
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Old 03-18-2013, 04:46 PM   #4
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If you're smelling coolant inside the Jeep, it almost has to be a leaking heater core.
Thats what i was thinking, I'm just wondering where the puddle might be. From what i have read it sounds like a pita to change the core.
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Old 03-18-2013, 04:47 PM   #5
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Thats what i was thinking, I'm just wondering where the puddle might be. From what i have read it sounds like a pita to change the core.
That depends on your mechanical ability and experience. The whole dash has to be pulled away from the firewall.
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Old 03-18-2013, 04:54 PM   #6
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That is what i was afraid of, i have pretty good skills but never attempted dash removal of any kind. Thanks for quick replies.
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Old 03-18-2013, 08:46 PM   #7
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That is what i was afraid of, i have pretty good skills but never attempted dash removal of any kind. Thanks for quick replies.
Did mine a month ago ... Took me 3.5 hrs

Hardest part was separating the hvac unit
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Old 03-18-2013, 11:10 PM   #8
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Did mine a month ago ... Took me 3.5 hrs

Hardest part was separating the hvac unit
Haha - took me 5 days

But I was taking my time...

These 2 write-ups were very helpful

http://www.wranglerforum.com/f5/dash...al-144267.html

TJ Heater Core Replacement - 1
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Old 03-18-2013, 11:18 PM   #9
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When you put it on defrost and heat do you get any condensation on the inside of the windshield? Also if you have carpet pull it up on the passenger side and check for wetness. I'd do some more thorough investigating before spending the time/money in replacing the heater core.
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Old 04-14-2013, 07:40 AM   #10
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When you put it on defrost and heat do you get any condensation on the inside of the windshield? Also if you have carpet pull it up on the passenger side and check for wetness. I'd do some more thorough investigating before spending the time/money in replacing the heater core.

condensation inside windshield yes, wet carpet passenger side yes! and smelly oily substance coming out of air blend motor, do I have to remove the dash?
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Old 04-14-2013, 08:44 AM   #11
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condensation inside windshield yes, wet carpet passenger side yes! and smelly oily substance coming out of air blend motor, do I have to remove the dash?
Dash comes out in 1 huge piece
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Old 04-26-2013, 06:38 AM   #12
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So if its not the heater core what else can be causing coolant to flow through air blend motor?
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Old 04-26-2013, 07:02 AM   #13
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So if its not the heater core what else can be causing coolant to flow through air blend motor?
Nothing.

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