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projectman 11-29-2012 08:54 AM

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?

ncb 11-29-2012 09:03 AM

Leaking heater core.

projectman 11-29-2012 09:16 AM

Is this a DIY or a take it in for repair job?

Joevacs 11-29-2012 09:28 AM

or a head gasket. Look at you oil, I hope you don't see milky oil.

projectman 11-29-2012 09:47 AM

Changing oil later today, so we'll see

projectman 11-29-2012 10:04 AM

Do I need to stop driving the vehicle?

GPV 11-29-2012 10:08 AM

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.

projectman 11-29-2012 10:10 AM

Is heater core replacement difficult on this model?

GPV 11-29-2012 10:36 AM


Originally Posted by projectman (Post 14526315)
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.

projectman 11-29-2012 11:49 AM

Carpet is wet under the passenger side floor mat...

JeepCares 11-29-2012 12:34 PM

2 Attachment(s)
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.

projectman 11-29-2012 12:35 PM

Changed oil and it looks normal. No milk.

projectman 11-29-2012 02:09 PM

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

Godholio 11-29-2012 02:19 PM

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.

projectman 11-29-2012 02:47 PM

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.

The time now is 02:39 AM.

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