White smoke from AC vents and smells like antifreeze - JeepForum.com

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post #1 of 16 Old 11-29-2012, 08:54 AM Thread Starter
projectman
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White smoke from AC vents and smells like antifreeze

Hey guys and gals...

New to the forum and I noticed a problem with my 2007 Jeep Wrangler Unlimited this morning.

It has around 38,000 miles on it.

Coolant level was a bit low, so I filled it yesterday.

What should I check first?

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post #2 of 16 Old 11-29-2012, 09:03 AM
ncb
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Leaking heater core.
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post #3 of 16 Old 11-29-2012, 09:16 AM Thread Starter
projectman
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Is this a DIY or a take it in for repair job?
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post #4 of 16 Old 11-29-2012, 09:28 AM
Joevacs
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or a head gasket. Look at you oil, I hope you don't see milky oil.

2010 Rubicon, 4" lift, Currie control arms and trackbar, 40" Procomp MTR
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post #5 of 16 Old 11-29-2012, 09:47 AM Thread Starter
projectman
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Changing oil later today, so we'll see
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post #6 of 16 Old 11-29-2012, 10:04 AM Thread Starter
projectman
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Do I need to stop driving the vehicle?
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post #7 of 16 Old 11-29-2012, 10:08 AM
GPV
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You will have to replace your heater core more than likely. It might be a leak at a connection or something but that is a bit optimistic honestly.

Sean

2008 Jeep JK Rubicon Unlimited (Bought for Wife)
2007 GMC 2500HD Duramax (Work Horse)
1982 Honda CB 900F Supersport
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post #8 of 16 Old 11-29-2012, 10:10 AM Thread Starter
projectman
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Is heater core replacement difficult on this model?
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post #9 of 16 Old 11-29-2012, 10:36 AM
GPV
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Quote:
Originally Posted by projectman View Post
Is heater core replacement difficult on this model?
I don't have any experience with the JK. I suspect that it is in the passenger cabin behind the glove compartment. If you are at all handy it should be a weekend job to change out.

Sean

2008 Jeep JK Rubicon Unlimited (Bought for Wife)
2007 GMC 2500HD Duramax (Work Horse)
1982 Honda CB 900F Supersport
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post #10 of 16 Old 11-29-2012, 11:49 AM Thread Starter
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Carpet is wet under the passenger side floor mat...
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post #11 of 16 Old 11-29-2012, 12:34 PM
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HEATER CORE REMOVAL (from the 2007 JK Service Manual):
WARNING: Disable the airbag system before attempting any steering wheel, steering column or instrument panel component diagnosis or service. Disconnect and isolate the negative battery (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to follow these instructions may result in accidental airbag deployment and possible serious or fatal injury.

NOTE: LHD model with A/C shown in illustrations. RHD and heater-only models similar.

See pic 1
1. Remove the HVAC housing assembly and place it on a workbench.
2. Remove the floor distribution duct from the passenger side of the air distribution housing.
NOTE: If the foam seal for the flange is deformed or damaged, it must be replaced.
3. Remove the foam seal (1) from the flange (4) located on the front of the HVAC housing (2).
4. Remove the screw (3) that secures the flange to the HVAC housing and remove the flange.

See pic 2
5. Remove the screw (1) that secures the bracket (2) retaining the heater core tubes (3) to the passenger side of the air distribution housing (5) and remove the bracket.
6. Carefully pull the heater core (4) out of the side of the air distribution housing.
Attached Thumbnails
pic1.jpg   pic2.jpg  
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post #12 of 16 Old 11-29-2012, 12:35 PM Thread Starter
projectman
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Changed oil and it looks normal. No milk.
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post #13 of 16 Old 11-29-2012, 02:09 PM Thread Starter
projectman
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Looks like I would have to remove the entire interior dash panel to get the heat core. That's crazy amounts of work for a part replacement. Ughhhh
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post #14 of 16 Old 11-29-2012, 02:19 PM
Godholio
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If you're smelling it through the vents and it's getting into the carpet, definitely a bad core/connections. Without those symptoms I would've been concerned about a head gasket.

Utah Jeep Crew #148
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post #15 of 16 Old 11-29-2012, 02:47 PM Thread Starter
projectman
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What should I expect to pay to have this repaired by a local mechanic if it is bad core/connections? Found the replacement heat core for about $100, but the labor looks like it would take me weeks.
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ac , antifreeze , coolant , smoke , vent

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