white smoke from defrost vents!!!!!!!! ???? - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 02-06-2012, 02:19 PM
Thread Starter
Join Date: Dec 2011
Location: glenville new york
Posts: 23
fivestar9968 is on a distinguished road
white smoke from defrost vents!!!!!!!! ????

the jeep has been sitting for about a week and a half. i decided to take it out and run it for a few days. so about 10 minutes in a thin white smoke started coming out of both defrost vents for about 15-20 seconds and then went away. i shut the heat off and fan down for a minute. sat there thinking the jeep might be on fire and nothing. started the heat/defrost back up and it actually seemed to be blowing a little stronger than it ever did before and the jeep wasnt on fire. im planning on driving this thing for a couple days should i be worried about something bigger?
fivestar9968 is offline   Quote
Old 02-06-2012, 02:45 PM   #2
Join Date: Jan 2010
Location: Las Cruces, NM
Posts: 2,303
Garyk is on a distinguished road
Did you smell any antifreeze, white steam from the heater vents usually indicates a leak in the heater core.

(Sold)1994 Jeep Wrangler 2.5L, Bestop top
/w steel half door and slider windows
5 speed, 2.5" lift, 31" tires,rack lights
Garyk is offline   Quote
Old 02-06-2012, 02:46 PM   #3
brent in az's Avatar
Join Date: Feb 2010
Location: Verde Valley, AZ
Posts: 580
brent in az is on a distinguished road
Coolant-related. Not saying you have a leak in your block, but I'm sure there's a small external leak in the cooling system I'd bet.

Or a fried thermostat on manifold.

Third possibility. On my AMC jeep I had power steering. The return hose sprung a leak to the steering box. Which squirted on upper engine causing white smoke under hood and through vents.

All 3 scenarios happened to me through the years and produced the effect you described.
brent in az is offline   Quote
Old 02-06-2012, 07:32 PM   #4
Join Date: Aug 2011
Location: north of St.Franisville La.
Posts: 3,483
Nubby55 is on a distinguished road
Send a message via Yahoo to Nubby55
water from rain Could have leaked in the vent, and when it got hot it blew steam in the cab!
Nubby55 is offline   Quote
Old 02-06-2012, 07:47 PM   #5
dmcg's Avatar
Join Date: Apr 2011
Location: dfw
Posts: 322
dmcg is on a distinguished road
It's your heater core. Just went through this. It will take about 3 hrs and $57 to replace. Be sure to buy one that is direct fit and not "free floating." It's actually a fairly simple procedure to replace. Do a heater core bypass until the core arrives. You don't want to be breathing that crap in
dmcg is offline   Quote
Old 02-06-2012, 08:45 PM   #6
Cali smog Nazi

WF Supporting Member
2xs's Avatar
Join Date: Jun 2011
Location: Santa Rosa, Ca.
Posts: 2,813
2xs is on a distinguished road

Check your heater core.

Old Jeep that was totaled (and SOLD!):
2xs is online now   Quote
Old 02-07-2012, 02:31 PM
Thread Starter
Join Date: Dec 2011
Location: glenville new york
Posts: 23
fivestar9968 is on a distinguished road
i did recently replace the vent cover on my hood to a raised scoop type! and it seems like anything could fall in there and burn up. shouldnt these come with some sort of filter protecting from things falling into the vent from outside? also, it smelled like something burning and it hasnt happened since. i have all fan speeds, i have heat and it blows strong. as far as the power steering thing, i havent seen any puddles underneath and no puddles on the inside from the heater core. so kind of a mystery right now. i had my thermostat replaced about 3 weeks ago and went from a 180 to a 195. the thing was sticking, not heating up plus the housing was leaking. so that should be good also!
fivestar9968 is offline   Quote
Old 02-08-2012, 05:01 PM   #8
Drpinkydo's Avatar
Join Date: Oct 2010
Location: West Chester, PA
Posts: 331
Drpinkydo is on a distinguished road
I have a piece of window screen under the cowl vent cover to keep crap out. Works great.
Drpinkydo is offline   Quote
Old 02-09-2012, 07:48 AM   #9
Join Date: Nov 2011
Posts: 717
ballistx is on a distinguished road
something burned

It is likely that something was injested into the system from the outside, leaf or something. It dropped across the fan selection resistor which runs quite hot. That is the reason it is in the air stream. That restricted the air flow across the resistor, let it get hot. It stared whatever it was smoking. When it was burned/etc. up then the smoke went away.

Woudn't worry about it unless it starts again. But I certainly WOULD get something over that entry. I had 1 rib broken out of my 98 Ram and that let a mouse get in. He couldn't get out and got decappitated by the squirrel in there. You want to smell something REALLY bad. Fortunately, I was able to rig up a smaller vaccuum hose and sucked him out..

NOT fun.

ballistx is offline   Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fan only blows out defrost vents... pslamp32 TJ Tech Forum 51 03-27-2016 05:12 PM
Smoke from the heater vents HELP! Fawbio72 TJ Tech Forum 49 08-23-2013 08:36 PM
yj white smoke k9dave2001 YJ Tech Forum 7 08-03-2011 09:05 PM
Air Conditioner blows out defrost vents on freeway CopperCrawler TJ General Discussion Forum 11 03-29-2011 11:22 AM
White smoke when the engine is cold jeeper95yj YJ Tech Forum 12 05-16-2008 08:35 PM

All times are GMT -5. The time now is 04:50 PM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC
« Back

Enter your email address:

Delivered by FeedBurner