Bad Smell Coming from Air Vents

I have a 95 Concorde with automatic climate control. Recently, I started
getting a bad smell coming in through the air vents. Does anyone have any
idea what this can be and what to do?
Al

 

What kind of smell? Is it sweet? With AC or Hear or Just vent on?
If it's sweet with the heater on, it's the heater core. Is your
anti-freeze low?

Ken

 

The smell is not sweet. I have the climate control set on automatic with
the temperature set for 72. My wife says the smell is something like horse
manure. It seems to be coming out of the air vents on and under the dash.
Al

 

| What kind of smell? Is it sweet? With AC or Hear or Just vent on?
| If it's sweet with the heater on, it's the heater core. Is your
| anti-freeze low?
|

And if it smells like BO in all modes it could be blocked condensate drains
and mold/mildew has begun to grow in the moisture.

 

Rooting Out the Cause of Manure Smell.
http://cartalk.cars.com/Radio/Show/Audio/200343/RA/s10.ram
(real audio link))

 

Check your muffler. I once somehow had a plastic bag get stuck to my
muffler and the heat melted the bag and what ever was in it.

Smelled awful, just as you described. Had to get under and scrape off
the stuff. Took a long time for smell to disappear.

B

 

I get the BO smell after using the AC for short trips. Then the smell will
be in all modes for a short time. How can I check/flush the condensate
drains?

Jeff-

 

Don't use your A/C on recirculate except for short cool-down periods. That
encourages mold growing there in the moissture that accumulates.

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