DSchimming

In my 2014 V6 E350 4MATIC the blower fan quit working. Tested Auto, Manual and Max Def and Max Cool. I can hear the vents opening, but no fan is blowing the air.

My first thought was a fuse...but the fuse map included (in the roadside tool kit) is of little help as there is nothing listed. Is there a fuse? It seems like it should be obvious.

Went by the dealership to ask....willing to set a 1 hour minimum appointment to diagnose (Certified Pre-Owned, but not under warranty anymore). In my experience, I've never left the dealership without a $1,000 bill and think I should be able to check a fuse on my own...and the manufacturer should provide accurate diagrams for my model, not just every W212 model.

Anybody have any thoughts, suggestions?

Prior to the fan not working, I'd had the Max Defrost on when I arrived home and shut of the car. I normally turn the climate control back to Auto, so the fan isn't at max speed when starting again, but may have failed to do so this time. Later in the day...my wife drove and doesn't remember any fan noise, but on auto it's rare that we even hear the fan and it was a fairly mild day. Later that same evening, I took the car out at night (now colder outside) and noticed that there was no air movement.

Do I need to buck it up and take it to the dealership...knowing that it will be a complete heating system replacement more than likely, whether it needs it or not?

Thanks,

Damon

CaliBenzDriver

Senecat

It was fine before your wife took it. Therefore your wife brought it back broken, therefore your wife broke it, therefore she gets to cough up the repair cost.

Problem solved.

DSchimming

And more money for bikes....I like the way you think!

Senecat

You're really going to need to pull codes if you wanna get serious about diagnostics. iCarsoft MBII will get you pretty far. If that doesn't get you fixed, probably gonna need access to a Xentry/Star system. There's like, 17 sensors involved in HVAC.

Plinko

Too bad no-one addressed the question: “Is there a blower fuse and where is it?”
i see the fuse for the rear blower but my main blower is the problem. Fuse 12 is listed as “ACC Control Unit” but not clear if that includes the blower. Besides, fuse 12 is fine.
I would hate to replace the blower and find that isn’t the issue, or the regulator.

konigstiger

You can check f158 / PIN1 (50A) for blower regulator @ front prefuse box, see attachments.

Ph07

an I ask? What was your outcome here?
I had this and it was fuse one under the hood in the main fuse box, ran well for a year than when hot agin just blew fuse one again..so I’m there