R0CK632

We had just had a snow storm the past few days - Approx 18 inches of snow and when I went into my car today to turn on the heat, Nothing blows out of the vents.. All The lights and diagrams light up but nothing blows out on heat or ac? Is it possible that something has froze causing it to not turn on or what else could it be? and how can i fix it.. Any Help would be greatly appreciated thanks..

LaicepsYdobon

Forgive me for asking the obvious but did you wait for the car to warm up a bit ? Benzes don't blow cold air into the passenger compartment when it is cold outside. The airflow will not start until your engine is warm enough (somewhere between 50-60 degrees if you look at the gauge on the dash) for the warm air to start being pumped into the cabin.

R0CK632

I was driving around for a good 30 minutes plus and nothing was blowing out of the vents..no air whatsoever...The engine was definitely warm enough i think..

cdn_mb

Happened to my car the first winter I had it. Dealer replaced the blower motor under warranty.

sinister55

Are the vents open?

I dont mean to ask a retarded question, but my cousin was complaining about this and her vents werent open lol

R0CK632

Thats ok and YES the vents are open you cant even hear the blower coming on... Could something like the blower freeze? Seems strange it happened after there was almost two feet of snow i was driving through?

LaicepsYdobon

30 minutes is plenty. Both of my cars start blowing hot air after about 5-7 minutes every morning on my way to work. Since you can hear the fans going I can't even suggest to you that it's a fuse. I don't think its something that we could diagnose. Your best bet would be to take it to the dealer and see what they can find.

R0CK632

You read it wrong..you can not hear the fans blowing

LaicepsYdobon

Sorry about that. In that case it could be something as simple as a fuse needing to be replaced. Dealership can take care of that for you in about 5 minutes. Just take it in to get a definite diagnosis regarding this issue.

Carsy

If your car was outside , snow & ice may have frozen your fan then blown the fuse when it was not allowed to turn. I would look at your fan.( under the bonnet.

keith100

Its been a common problem with melting snow building up in the heater box and freezing the fan solid. Try and get the car somewhere warm and let it idle. The fan may restart as the heater box thaws.

Good luck

RLE

The heater fan is located behind the underhood water trap above the battery. It's a black semicircular plastic box at the left rear as you face the car.

Release the spring clips at each end of the back edge along the firewall. You can then tilt the box forward and look in at the vertical squirrel cage blower.

Ron Jr

Common problem with early 08 W204's the box the blower is mounted in has no drain holes and the water builds and finally freezes the motor in place which then burns out trying to turn. Go to your AD and they will fix it like they did mine. Happened on the coldest day in winter 09 to me, was not a fun drive to and from work that day.

IllusionX

I just had this happen to me, the heat works okay now I'm just guessing that it was frozen =[, you think I should have it replaced also?

Oh, and now my drivers window won't auto-close.

Peabody

to fix the window just run it down and hold the switch down for 10 seconds and then run it up and hold it up for 10 seconds. It just needs to be reset, seems to happen to everyone once.

noka

This thread was about no heat. Maybe you posted in the wrong one?

noka

Did they do a redesign later to fix it?

Ron Jr

Yes mid 08 production year they added drains to the bottom. There is no recall but it is a known issue. They must not think it is needed in places like SoCal or Florida so why recall all just fix as needed.

R0CK632

Thanks Guys.. Iam taking it to the dealer on tuesday..Ill have them put in a new one..Thanks for the heads up!

MBNUT1

Read the post above it

"I just had this happen to me, the heat works okay now I'm just guessing that it was frozen =[, you think I should have it replaced also?

Oh, and now my drivers window won't auto-close. "

R0CK632

I took off te battery cover like suggested and opened the blower and gave it a little spin which freed it up now works..thanks guys.. Still bringing it to the dealer though .. At least i have heat till the

noka

Note to self: Wear glasses when using computer.

mcruzStratford

rock632 had same problem back in January.
Its 15 degrees outside, turn on my MB to warm it up. Heat does not go one. Lights light up on the controls, but nothing.

Has anyone else had this problem? Out of warranty and dont know what to expect from MB Service.

csl2134

My blower motor failed yesterday (PN 2048200208). I had the problem diagnosed at the dealer in Mechanicsburg, PA today and the diagnosis is burned out blower motor. As you know the internet already published the fact that a missing blower housing drain hole causes this problem in early 2008's. The problem was fixed by MB later in the year but no recall was ever issued.
My c300 has 68000 miles on it and I found out that neither the dealer nor MB really care about my problem. I talked to both of them on the phone. At MB I had a very stressed, irate and unfriendly female on the phone who felt bothered and told me to call the service manager at the dealership. The dealership service manager told me that the car is out of warranty.
Neither of them seems to understand that consumers buy cars with good quality reputation for reasons of quality, trouble free operation and longevity.
The bill is 460 bucks. I'll get it fixed and change brands ...

vatamian2010

hi anyone can help me out when i turn the fan on auto all the lights will come on but the fan won't come on the fan blower it is very tight the power it is not even on