PHIL2116

I got a second-hand W204 C300. I met a problem. I will meet the rubber burning/ plastic smell when strong driving(over 90miles/hr). I tried the smell is strong in the air-con with internal circle mode, maybe 1~2 mins then the smell disappeared. If I turn off the air-con, no burnig smell. anyone met the same?

Domm

Is there a particular reason you were going 90 mph? Did you launch from a dead stop?

Carsy

You need a nose cone heat shield

Glyn M Ruck

Did this happen once or can you reproduce it every time you do 90 mph?

PHIL2116

HI Glyn,

Mostly I will smell, from cool car to 90mph. The smell happens 1~2 mins, then disppear. When the car is hot from 90 mph, you won't smell again. I tried to test in different mode as below.
- A/C ON with in-car circle mode, the smell is the most strong
- A/C ON with out circle mode, the smell is not such strong
- A/C OFF with out circle mode, no smell
- Air-con OFF, no smell
I'm thinking it seems that the smell happen with air-con working. Is it possible the instant RPM to higher the voltage to heat up the resistance of the air-con system? Is it possible this is caused by the blower regulator? I just thinking the clue from air-con system.
thx...

C3504matic

Just bringing this back . Did you find the problem ???? my c350 is doing the same thing and it's driving me crazy trying to find it . I've looked at everything under the hood , all wiring and under dash rt side and can't find it but now since playing with wiring and unplugging and replugging it's gone from full time burning smell to intermittent . It does not smell if I put on recirculate and it's not the t/lamps or the back of the cylinder heads . Mines got 20,000 miles

vipsa

Have either of you replaced your cabin filters? Very possible they're full of crap if the car's older and hasn't had those replaced.

stratman1954

LOL

PHIL2116

@Vispa, yes I replace the cabin filter every 10k KM.
@c3504matic, this problem still not solved...As I know lots of W204 go the same problem...

craiger13

Ok fellas, I just wanted to know after a hour or so of driving after I park my car in the garage, 10 minutes or so, there is a smell of Rubber in my garage, is that normal?

Adi-Benz

oil centrifuge

Funkwagen

This, the cover to it is probably leaking.


Here's the new one (right) by the left, you'll see that the old ones seal has sort of flattened out. I was seeping oil quite badly from here and it was dripping onto the right bank catalytic converter, making it smell like an oil refinery inside the car whenever it happened. Replaced the cover and all is well, and has been for the past 40,000km


If no leaks are present from there, check all the rear camshaft seals, they tend to seep as well

Check all of that, you'll probably need a small mirror to inspect all the seals properly. If you don't find anything up top, you'll have to get the car on a lift if there's no oil drops on the ground. Sometimes the panelling under the car will catch any dripping oil, so you'll want to remove them.

Adi-Benz

Hey funk how much did that new cover run you? No diy necessary or did you use something?

Funkwagen

I don't remember the exact cost but I think the cover was close to about 40-50 dollars Canadian. DIY was really simple, 3 bolts and the cover came off, cleaned surface and replaced

Adi-Benz

That's what I was thinking. If I keep the car I'll be doing it. Thanks

Adi-Benz

Funk where did you buy the cover?

Adi-Benz

Found these two - look the same but big price gap?



What do you think?

Funkwagen

Not sure which to pick but 17 bucks seems very cheap, I bought mine from the dealer for about 40-60ish iirc

Adi-Benz

I know, not sure if its like the wiper blades and filters...made by original company but with the badge on it, it is more expensive.

Do you have a photo or diagram or reference to where the cover is?