I have a 2007 Chrysler Aspen, and recently (past 2 weeks) when I turn on the ac, I notice a 'foul' smell, like burnt rubber, or even sulphur-like. The smell will last a few minutes and will gradually fade away while the ac is running. Since this has not happened to me before, I need to know if something is going on with the ac. I would appreciate any help or suggestions with this concern.

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    Just FYI: That title was terrible. A more descriptive title will help folks get you an answer that will clear up your issue ASAP. Commented Sep 28, 2011 at 23:41

2 Answers 2


You might want to consider the following answers. They might be relevant to your situation:

toyota corolla 2001 air duct smell

Heater smells like sulfur

Why does my A/C blow foul smelling air when it first turns on?

Here's a subset of what I suggested for the "heater" question:

Leaking gear lubrication (which can smell like sulfur) combined with a bad seal in the ventilation system (or an intake that catches a whiff). Check for drips under the car: they should have the same smell. If they're there, look for leaks around the transmission or differentials.

Hydrogen sulfide from the catalytic converter, again getting picked up by the ventilation system. If so, this is possibly a bad cat.

Hopefully, one or more of the above discussions will help you in this situation.


Try changing cabin Filter and see if that makes difference if you have not changed lately. Generally Cabin Filter is under Gloves Compartment on Passenger Side

  • This would be my first guess as well. I once had a mouse find its way into the fan where this filter resides...poor little guy.
    – agradl
    Commented Jan 5, 2012 at 15:44

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