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Discussion Starter · #1 ·
Good day to all. I have searched the forums for my situation with no results. 2014 CTS-V Wagon, owned since new, 7K on the odometer, garage kept. Since new have had bad odor inside in the following situations: driving windows up with vent system off; vent system on in RECIRC mode; windows up with sunroof in vent position. This does NOT smell like: mildew, gas, exhaust, plastic, or oil. Smells more like formaldehyde and will cause illness and itching eyes after 20 minutes driving in the above situations. Thought it may be upholstery gassing but after eight years is as prominent as new. As a mechanic, any thoughts will be helpful and thank you in advance.
 

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'14 CTS-V LongRoof; Audi RS6 Avant; '16 ATS-V Sedan gone; '10 CTS LongRoof gone
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More problems than this, but have you changed your air filter? When doing so, take a look around and see if there are any foreign objects or dead animals in the duct system.

Is there anything under the seats? Have you removed the rear seat to see if anything is under it?

Have you looked in the rear area under the back end where the Bose amp is?

Water leaks causing rot? The sunroof is known to leak. Have you performed the sunroof drain repair as outlined in the regular CTS forum?
 
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Gut it. Like this.




Clean it. Vacuum the engine compartment, especially the intake vents on the windshield cowl. Vacuum and wash the doorjambs. If there’s any amount of clutter in the vehicle there’s a chance something old & nasty is lurking somewhere underneath, like an old hamburger or something.

Check & change your cabin filter.
 

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Discussion Starter · #4 ·
Thanks for the replies. Cabin filter changed 3 years ago and six months ago. Air filter six months ago. No debris or objects observed. Car has never been driven or out in the rain or wet roads. Never trash or eating in the car. Odor has been present since bought with 47 miles on the odometer when bought from Hendrick Cadillac, where it was kept in the showroom. Will look under seats and rear this morning.
 

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'05 CTS-V
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If you don't find anything, maybe give it to a professional detailer, someone who is accustomed to deep cleaning a car, to see if maybe they can find the source?

Did you ever address it with Hendrick Cadillac back when the car was new? If so, what did they say?

Is the car always closed up in the garage? If so, maybe let it sit with the windows down to "air out", either in the garage or out in the sun on a nice day?
 
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