C350King

Yep...I found it! Anyone want to know what's causing it? I've parted out a W203 C class and tore my W204 C350 apart to find it's source ))

The waxy "thermoplastic" material is underneath the HVAC, center dash and under front carpet. It wraps around the transmission tunnel, and feels waxy. Usually is light brown or black depending on model. To get to it, pull up the carpet pieces for the driver and passenger sides. Look in the space between the radio, hvac and it'll be there. You can just pull hard and rip the disgusting stuff out.

Lemme know if this helps get rid of the smell, cause now my car smells much better. Another location where the smell comes from is the rear speaker/trunk lid area, the insulation stinks there too.

Here's an example. https://www.ecstuning.com/b-genuine-...on/1406820301/. Please leave a "thanks" if this helps!

C350King

There's some waxy materal near rear struts, also some is permanently fused to underside of carpet.

snk0303

Snowhite63

I just pulled that waxy stuff out my car so ill post pics and give feed back after a few days if it does the trick.

snk0303

Snowhite63

If the car is not losing power or making a noise it should b ok. if you pull the intake pipe off and no oil is on the blades the seals are good.
Turbos go through oil and smoke when they start to fail.

Snowhite63

A+++ on the Crayon smell its 95% gone i think because the wax has been in there so long there is a light lingering smell but its nothing like it was. Im excited its gone!

Mr. Toad

My car doesn't smell like "burning crayons"; are you saying that there is a defect in the manufacturing of your vehicle?

C350King

If the car smells like "burning crayon" it's probably cause the temperature around the shifter/exhaust tunnel area wax material is getting hot.

Concerning the wax smell in my case it also had seeped into the carpets and seats...so it was only greatly reduced...but not completely gone. Some cars are worse than others but this post was made to help people at least reduce the smell.

C350King

So happy to hear !

Angie19

Have the same issue with crayon smell. I am hoping you could explain or show a picture of how you removed the the carpet to find and remove the wax. Hoping as well mine is coming from the same issue! I hate the smell...

Snowhite63

Act as if you were to change the cabin air filter, pull back the floor carpet then un tuck the carpet connected to the center console that goes under the dash.
Once pulled back you should see the trans tunnel a black hose and that dreaded tan looking waxy sound pad. Cut it out and/or pull it out.

mcgsxrclk500

The oil spill comment is a fair one. I have noticed an odd smell in my new to me 2005 since March. Initially I assumed it was just the smell of the car, but a month with an air sponge and it still smells odd especially if left closed up for a couple of days. Kind of oily.

I did clean out the trunk recently, and did have a strange "solution" covering parts of the tire and tools etc. I think I will go through it all again and see if that helps.

klcraleigh

Are you still smelling the crayon smell? We just purchased a 2014 GL450 and the crayon smell permeates the entire car. We've had the cabin air filter changed and nothing changed. It's nauseating. Dealership says 'smells like a new car.' A 2014 shouldn't smell like a 'new car.' Ugh!!

Snowhite63

Nope! the smell is totally gone for me. After i removed the waxy insulation i sprayed a air neutralizer spray a few times where the pad was.

klcraleigh

Thanks for your reply back. I'm going to bring it back to the dealership and see if they'll do what you suggested. I hate to go in myself and start pulling stuff out of a car I just paid $37k for

almostordinary

Just got an 08 G55, and my 07 E63 never had this smell. The wife pointed it out as we took it on our first long drive today. Going to look to knock this out next weekend.

Super Venio

Thank you, for precious informations... can you upload some pictures to show how i can pull up the waxy thermoplastic?
Thanks a lot.

keef o'keef

Just got a pretty smelly '15 GLK 250 Bluetec

Have you noticed any issues after removing the insulation? Hate the smell, but just figure there has to be a reason for it being there. Thanks!

samc207e500

hi,

just wandering how id go about pulling the foam away from under the floor carpet (as in will it impact anything?