No air from vents after blower motor replacement?
Thread Starter
Member
Joined: Jan 2006
Posts: 178
Likes: 4
From: Austin, TX
2012 C250
No air from vents after blower motor replacement?
Hello All.
I hope you might be able to help me with this since I've searched the forums and the googles and have yet to come up with some useful information.
Earlier today my blower motor finally gave up the ghost. after making some annoying grinding sounds, I turned off the AC so I could concentrate on an email I was working on. The blower never turned of its own accord again. After pulling the blower motor and applying a 12 volt current to it, it was still dead. upon turning the motor upside down, all the magic smoke that powered it dumped out and landed as dust on the counter.
I bought a new blower motor and replaced it, but when I buttoned everything back up, while I can hear the fan turning briskly as it should, I am not getting any air coming out of any of my vents. Is there some sort of reset procedure I should try?
Last winter I took the blower motor out and cleaned the contacts as they had been corroded. After that it worked like a champ so I'm not sure that I did the procedure wrong this time.
Any insight would be much appreciated.
Oh, I should note that I have a 2003 W211 with analog HVAC controls.
I hope you might be able to help me with this since I've searched the forums and the googles and have yet to come up with some useful information.
Earlier today my blower motor finally gave up the ghost. after making some annoying grinding sounds, I turned off the AC so I could concentrate on an email I was working on. The blower never turned of its own accord again. After pulling the blower motor and applying a 12 volt current to it, it was still dead. upon turning the motor upside down, all the magic smoke that powered it dumped out and landed as dust on the counter.
I bought a new blower motor and replaced it, but when I buttoned everything back up, while I can hear the fan turning briskly as it should, I am not getting any air coming out of any of my vents. Is there some sort of reset procedure I should try?
Last winter I took the blower motor out and cleaned the contacts as they had been corroded. After that it worked like a champ so I'm not sure that I did the procedure wrong this time.
Any insight would be much appreciated.
Oh, I should note that I have a 2003 W211 with analog HVAC controls.
Last edited by purplegrog; Mar 13, 2015 at 11:30 PM. Reason: additional detail
Out Of Control!!
Joined: Jul 2003
Posts: 15,901
Likes: 4,630
From: North Scottsdale, AZ
'71 Pinto
Thread Starter
Member
Joined: Jan 2006
Posts: 178
Likes: 4
From: Austin, TX
2012 C250
Out Of Control!!
Joined: Jul 2003
Posts: 15,901
Likes: 4,630
From: North Scottsdale, AZ
'71 Pinto
If the blower is running but there is no air at any outlet, this can be an indication of icing in the evaporator. This symptom disappears when the vehicle and the engine are left off for a certain time (the ice at the evaporator thaws). In addition, check interior combination filter for contamination and visually check duct between engine compartment and blower.
Thread Starter
Member
Joined: Jan 2006
Posts: 178
Likes: 4
From: Austin, TX
2012 C250
Thanks for the suggestions! I checked the filter and while dirty I don't think that's it. With the filter removed I still get no air flow. I let the car sit overnight so any ice should have thawed by now. Is there a way to reset the flaps myself? I can hear them moving but I wonder if they need to be resynced. Anyone have any other suggestions?
I'm at my wits end and even tried to take the car to the dealer but they won't see me until Wednesday.
I'm at my wits end and even tried to take the car to the dealer but they won't see me until Wednesday.
Out Of Control!!
Joined: Jul 2003
Posts: 15,901
Likes: 4,630
From: North Scottsdale, AZ
'71 Pinto
Interesting, simply replacing blower should not cause this, definitive diagnose have an independent with MB DAS pull codes.
Last edited by konigstiger; Mar 14, 2015 at 11:43 AM.
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Thread Starter
Member
Joined: Jan 2006
Posts: 178
Likes: 4
From: Austin, TX
2012 C250
So the additional details on this are that the blower motor I got from autozone - http://www.autozone.com/cooling-heat.../69602_0_1526/
was NOT the exact fit the site claimed it was. Number one, the housing was incompatible with the the car, so screws did not line up right. I was desparate to get back on the road, and having no moving air in your car in texas is almost worse than a bad AC compressor. at least with a bad compressor there is air moving instead of baking you.
so, I ended up doing a really ghetto retro fit putting the fan into the old behr housing. As part of the retrofit, I had to use the old connector from the bad blower motor, because the connection on the new blower motor to the regulator had the wrong gender. After I got everything wired up, the fan spun no problem, but there was no air movement. it turns out that on top of not being an exact fit, not having the right connector on the replacement fan, the fins actually are turned in opposite directions from the OEM, so air was not being directed anywhere. I pulled the fan back out and refit the connector so the brown and red wires were opposite from each other, reversing the spin of the fan, and now everything works again.
TL;DR - Autozone's replacement fan is not compatible, and the fins are pointed in the opposite direction from the original.
was NOT the exact fit the site claimed it was. Number one, the housing was incompatible with the the car, so screws did not line up right. I was desparate to get back on the road, and having no moving air in your car in texas is almost worse than a bad AC compressor. at least with a bad compressor there is air moving instead of baking you.
so, I ended up doing a really ghetto retro fit putting the fan into the old behr housing. As part of the retrofit, I had to use the old connector from the bad blower motor, because the connection on the new blower motor to the regulator had the wrong gender. After I got everything wired up, the fan spun no problem, but there was no air movement. it turns out that on top of not being an exact fit, not having the right connector on the replacement fan, the fins actually are turned in opposite directions from the OEM, so air was not being directed anywhere. I pulled the fan back out and refit the connector so the brown and red wires were opposite from each other, reversing the spin of the fan, and now everything works again.
TL;DR - Autozone's replacement fan is not compatible, and the fins are pointed in the opposite direction from the original.
