By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. But a surprising number of drivers have documented reports of steam coming from their car's vents, so we asked some automotive experts about the cause of the mysterious steam. | So depends. rain, I turned on the air conditioner, and a white mist began pouring out of the vent in the cabin. Moisture produced from the dehumidification of air is eliminated through the unit’s drainage pipe. What causes the Air conditioner to blow black greasy foam out of the vents? So if you’re seeing black particles coming out of your air conditioner vents and you’re a fan of burning candles or your fireplace, the most likely culprit is soot. Power steering seems to be coming out of its reservoir from the top. Afterwards, you should notice that you aren't getting that fog from the vent (or at least quite a bit less). I cannot think of any other possibility.". If there’s a small pinhole — which is a small leak typically caused by corrosion — in the heater core, drivers may have steam coming from the vents, but it will likely smell of coolant. “There have been a few [A/C systems] that have needed to be repositioned through the years, but most just need to be cleaned out. How can I make sure I'll actually get it? Turn on the car, blast the heater, then run back inside to the air conditioned house. Cause Of Black Dust Around Air Vents It is a known fact that air-conditioners produce moisture. However, there's a good chance that running the recirculation with the windows closed will lead to dryer conditions in the air channel. Otherwise the car looks, sounds, and feels fine to drive. The A/C works fine except that it now blows black greasy foam out of the vents everytime it is in use. The content of this field is kept private and will not be shown publicly. An HVAC contractor had just installed a new motor in her home’s furnace. But behind the dashboard pushing that air through the climate vents is a simple fan called a blower motor. My friend who is also a mechanic tells me I have to find the 2 hoses up against the firewall (under my hood) I guess 1 hose for a/c and other for heat and he told me to connect them together and I won't be able to use my heat or a/c until I get it fixed and not to drive like that for along time cuz it will get worse in the long run. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If you can't fix the problem yourself, you may want to take the car to a mechanic to ensure it isn't a larger problem. If black dust blows out upon activation, turn the unit off, open up the panels leading to the different components of the air conditioner and clean the interior with compressed air or a mild cleaner and cloth. Gm Eb Bb F. Asking for help, clarification, or responding to other answers. If the evaporator core has a small pinhole, it may spray a fine mist of [refrigerant] from the vents. Seeing foam coming out of vents: jyhuh28: TDI 101: 5: September 22nd, 2014 11:39: No air coming out of my vents: JoshuaL: VW MKIII-A3/B4 TDIs: 1: March 16th, 2014 03:56: Blend door issue, but no foam coming out of vents: batkc: VW MKIV-A4 TDIs (VE and PD) 15: September 4th, 2013 18:52: Bits if Black Foam Gasket Blowing Through Air Vents … How can I download the macOS Big Sur installer on a Mac which is already running Big Sur? Anyway, thanks I'll give this a try! I would be afraid the high pressure of a compressor could damage the blend doors inside the dash. To learn more, see our tips on writing great answers. I just experienced this this morning on my way to work, I had the AC blasting and fog was coming out from a single vent. If the air temperature near the unit is below the dew point, this causes water vapor to form in the air and condense into water droplets, … Initially thought it was just the cabin filter, replaced to no avail, then read about air-cond fin corrosion + potentially associated with failing water-pump. My 2001 626 v6 has started blowing black stuff out of the registers either when using my AC or when it sits idle for any length of time. What Is That Brown Spongy Stuff Coming Out Of My Cars Air Vents? Subject: smoke coming out of my air vents. The fog may only come out of one vent, say for example if it's the first vent in the group so it possibly gets more flow. If an electrical problem keeps it from turning on, no cool air will flow through the vents … Hi, Over the past few weeks, I have also noticed white powder blowing out of air-vents on my 2009 Auris 1.33 TR, about 32k miles. As cool air flows through the vents on hot days, the moisture in the air can condense inside the air vent. That truck had two electric motors that change from hot and cold air and from vents, floor, and defrost. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Service. If you run hot dry air through the system for a while, it'll dry out quite a bit. Building a source of passive income: How can I start? "As the leaves get wet, they turn into tea and the acid in the tea eats at the aluminum cores, causing pinholes.”. Contractor License: 740999 All over her beautiful carpet. Looks like the foam surround that goes around the blower motors and AC doors is deteriorating and blowing out the vents. rev 2020.12.3.38123, The best answers are voted up and rise to the top, Motor Vehicle Maintenance & Repair Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. "These two components usually leak because of leaves that drop in the vent intake located at the bottom of the windshield,” he says. The air vents reside on the outside near the windshield. I just experienced this this morning on my way to work, I had the AC blasting and fog was coming out from a single vent. How Much Does a Cabin Air Filter Cost to Replace? What would happen if undocumented immigrants vote in the United States? My manager (with a history of reneging on bonuses) is offering a future bonus to make me stay. The above two methods are about cleaning the air duct and air filter that are on the interior side of the car. one is located on top or on the side (facing the seats, behind the center dash piece) of the air box in the dash, and the second is on the left side of the air box next to the radio module above the gas peddle. Mosquitoes can also come through the vents of air conditioners and inside your house. What is the Black Dust Around Air Vents? "The odorless steam coming from the vent is possibly excess water accumulating in the heater box, which may indicate the drain hole is restricted and needing cleaned,” he says. "There’s no replacement normally,” he says. Moisture that is produced due to dehumidification of air is disposed through the drainage pipe of the unit. I turned off the AC, waited a while and tried again. Fog or smoke coming out the air vents is caused by cold dry air coming in contact with warmer, more moist air near the air conditioner. Dad marched them all out to the backyard on that hot afternoon to see if the air conditioner was running. Bill Allen, owner of Mechanics Plus in Casselberry, Florida, says that air flows through a heater core and an evaporator core before exiting the vents. It occurs when the refrigerant in the air system breaks down and is no longer the chemical it was when it was put into the system. If there’s a small pinhole — which is a small leak typically caused by corrosion — in the heater core, drivers may have steam coming from the vents, but it will likely smell of coolant. Changing air filter gets rid of car smell Cleaning the Air Vents. Eventually, mold can grow and this will no longer be odorless. Called a blower motor does my A/C blow foul smelling air when it first on. 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