Q: Aircon blowing out white stuff.

asked by on

Hello, my aircon has been blowing out white dust every time I hit the max button.Today a lot of the dust got into my eyes and it is irritated. Any idea what the substance is? I am really worried it is harmful... thank you.
My car has an automatic transmission.

There shouldn’t be any dangerous materials in the AC system. But it is possible that you have a buildup of dust or even mold. Your car has a cabin air filter that is supposed to keep anything out of the heat exchanger box, but if something is already in there, the cabin filter won’t stop it. In some conditions, the filter itself could be breaking down into dust. Believe it or not, one of the big problems we see in automotive air conditioning is mice. They love to go down the little tunnels and build nests. If you have mice you will notice a distinct "mousy" smell in the debris. I think the first step is to replace the cabin air filter. You can contact Your Mechanic to have a technician come right to your home or office and do the job for you. and let you know if anything further might be required.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Aircon blowing out white stuff.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: When I turn on my A/C it smells like transmission fluid

The first thing to check is to see if you have any kind of engine or transmission fluid leaks that the air conditioner could be drawing in the smell of the oils into the A/C air intake. If you have...

Q: My clutch is stuck. I can still change gears but with a grinding noise.

Hey there. Your clutch is hydraulically operated. The clutch slave cylinder uses brake fluid from the master cylinder to engage and disengage the clutch. If the brake fluid level is good and the return spring on top of the clutch...

Q: Car starts on cold mornings, then shuts off while driving

It sounds like you've been addressing a number of issues. Of the parts that you have had replaced, only the crankshaft sensor would be one that would be likely to cause your car to shut off while driving. You could...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...