Yep, this was almost worse then having engine failure. On the way to an SCCA banquet/awards ceremony I decided to take the Mercedes running on WVO to show my fellow gear heads. I had my date, and another couple in the car. The 300D turbo was running flawlessly and we were having a good time driving through the concrete jungle that is Phoenix (probably WAY hotter then 107 on the roadway) toward the banquet site.

Just as I entered the freeway I turned the climate control fan from auto to full since the back seat passengers were complaining a bit. It began to cool the cabin down nicely and everyone was happy. Suddenly... without any warning or weird noises, air stopped coming out of the vents all together.

Brief history on the HVAC system of this car:

- New A/C condensor
- New belt
- New dryer
- New R12 freon
- New blower motor brushes
- Checked and tested by an authorized Mercedes technician last week (you would have all this done if you lived in the desert too).

Sooo... I'm hiding at my parent's house with 150 miles of desert to cross to get back to my house. I found instructions on how to remove the blower motor and I will check all fuses... but does anyone have any insight on what else to look for?

Thanks!

What is the condition of you push button unit, have you checked the fuses yet?

Fuse sounds most likely, followed by CCU. Did anything happen on defrost?

__________________
Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John

I agree with the above suggesstions, the blowers don't usually just "die" they make lots of horrid "help me I am dying within the next 100 hours of use" sounds. I'd guess fuse or Pushbutton unit issue like was said above.

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

I had the opposite scenario. Blower quit last December and I spend a month with the SD in the cold.......down to 12°F. at times.......no blower.

Test the blower itself, first. If it doesn't work with 12V applied, you found your problem.

But, if it does work, you've got three more possible culprits:

1) CCU
2) Blower controller
2) Blower resistors.

Normally, if one of the resistors fails, the blower will run on certain speeds but not others.

In my case, I swapped the CCU and that was the culprit. Swapping blower controllers made no difference.