W205 - slooooooooooow demist

[Timw4077]

hi guys

My w205 rear windscreen is incredibly slow to demist. (Twenty minutes of driving to fully clear). I used to have an 11 plate c180 (not sure which model) and it took some time too but this is way worse.

Having had a BMW for the last few years the rear windscreen has demist incredibly quickly. Is it a fault with the Merc or is it the norm? (I am inclined to think fault but before i go and annoy the dealer thought i would ask the question here...)

Ive typed this and now definitely think its a fault when i think how long it takes to clear but hey i have written this now so hitting submit

[James TiT]

How many of the filaments are broken?

[RicksAlfas]

I've got a W205 and the mirrors and rear screen clear quicker than my old BMW (E90).
Sounds like it's not right I'm afraid.

[Timw4077]

James TiT said:

How many of the filaments are broken?

It doesnt look like any of them are broken... just mega slow

[jkh112]

Check that the wires supplying power to the screen are making a good connection. I am not sure where they are on your car but you should be able to see where the filaments go off the screen and the connectors will be close by.

[James TiT]

Has the fuse blown?

[Timw4077]

Just had an interesting call from the dealer before its due to go in tomorrow.... they dont think there is an issue.... (they havent even seen the car yet!)

I am going in first thing in the morning to see one of their fleet C-Class demist (would rather watch paint dry....) but really dont think twenty minutes to demist is right in anyone’s book.

[RicksAlfas]

I used my rear screen this morning and you could see the lines within seconds of pressing the button and within a couple of minutes the screen and mirrors were clear. This was only condensation though, I wasn't trying to burn off a rain storm!