smoke/fog coming out of the air vent - Honda-Tech - Honda Forum Discussion


Honda Accord (1990 - 2002) Includes 1997 - 1999 Acura CL

smoke/fog coming out of the air vent

Reply
 
 
 
Thread Tools Search this Thread
Old 11-26-2013, 07:55 AM   #1
Honda-Tech Member
Thread Starter
 
dtran002's Avatar
 
Join Date: Aug 2004
Location: anaheim, ca
Posts: 581
Default smoke/fog coming out of the air vent

Hey guys, lately I notice that once in awhile, and usually it either happen in the early morning or late at night, there are smoke or steam like coming out of my air vents. If I turn on the air or AC, the smoke went away. I searched around, some said it could be just hot and cold air mixed together, causing this steam to come out. There are some said my heater core could be leaking. My coolant does go low, but that happened the past 3 years, and the rate is very slow. Is there a location where I can check if I do have a leak inside the car? It is a 95 Honda Accord.

Thanks.
dtran002 is online now   Reply With Quote
Old 11-26-2013, 11:40 AM   #2
MM Gruppe B
 
MAD_MIKE's Avatar
 
Join Date: Feb 2009
Location: 94577/Gaillimh
Posts: 5,809
Default Re: smoke/fog coming out of the air vent

If the heater core is leaking and the drain is no longer working the carpet may become wet.

Turn the defrost on(AC off) if the condensation on the windows gets worse then it most likely is the heater core. Would also smell 'sweet' from the antifreeze.
MAD_MIKE is offline   Reply With Quote
Old 11-26-2013, 12:08 PM   #3
Honda-Tech Member
Thread Starter
 
dtran002's Avatar
 
Join Date: Aug 2004
Location: anaheim, ca
Posts: 581
Default Re: smoke/fog coming out of the air vent

The car smell bad lately when I turn off the recycle air, but it not a sweet smell. I will test out what you mentioned and see if thats it. Thanks
dtran002 is online now   Reply With Quote
Old 11-26-2013, 07:51 PM   #4
Honda-Tech Member
Thread Starter
 
dtran002's Avatar
 
Join Date: Aug 2004
Location: anaheim, ca
Posts: 581
Default Re: smoke/fog coming out of the air vent

So I drove home today, no steam coming out of the vents, although the smell is there. It could be smell like antifreeze burning, but a lot stronger I guess. After I shut off the car, left for less than 5 minutes, I saw some fog build up in the windshield. I did what Mike said, no worse or better. I checked both driver side and passenger side carpet, and looked under the dashboard, no sign of any leaks.

What other location I need to check? Anything else to test?
dtran002 is online now   Reply With Quote
Old 11-26-2013, 10:02 PM   #5
Honda-Tech Member
 
Join Date: Dec 2008
Posts: 10,699
Default Re: smoke/fog coming out of the air vent

Sounds like textbook heater core leakage. I just replaced mine and my coolant loss was very small but noticeable every other day or so about an inch lost from reservoir
holmesnmanny is offline   Reply With Quote
Old 11-27-2013, 08:57 AM   #6
Honda-Tech Member
Thread Starter
 
dtran002's Avatar
 
Join Date: Aug 2004
Location: anaheim, ca
Posts: 581
Default Re: smoke/fog coming out of the air vent

Is it hard to replace? Do I have to take out the dashboard? Or am I safe to leave it alone and keep an eye on the antifreeze fluid?

Just searched around more, look like I might go the bypass the heater core route. Would that be safe for a long time or is that just a temporary thing?

Last edited by dtran002; 11-27-2013 at 10:10 AM.
dtran002 is online now   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Steam/white smoke coming out of exhaust manifold mecca858 Acura Integra 0 06-18-2015 09:23 AM
95 Civic Coolant problem dizzi Honda Civic / Del Sol (1992 - 2000) 11 09-01-2012 12:43 PM
Steam coming from front end!? jayzeno Honda Accord (1990 - 2002) 5 12-26-2010 05:12 PM
white gas/smoke coming from the air vents! aeon Acura Integra 7 07-03-2004 07:27 PM
AC.....Vents a smoking? PoonHunter Honda CRX / EF Civic (1988 - 1991) 13 06-05-2003 05:19 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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



All times are GMT -8. The time now is 07:52 AM.


 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: