Heater blower motor
01-15-2023, 07:45 AM
#1
Heater blower motor
My 2010 GLK 350 has blower issues. When I start the GLK the fan works fine , at all speeds. After driving it for awhile if I turn off the car for 2 mins and get back inside and start the car the fan won't come on. if if drive like that sometimes agfter about 30 minutes it will suddenly start or if i leave it off for a long while. Its seems to not be able to turn back on until it is well cooled down. Is this the blower fan that needs to be replaced or the blower resistor. ?
01-16-2023, 02:59 PM
#3
Member
Hey Tom, I had to remove my blower assembly (takes some standing on your head), and rinsed the motor in alcohol to clean it (2013 GLK350), dried it and put it back in. Has worked fine for 2 winters.
Maybe try this to see if it is the issue. The brushes in my blower had lots of life left. There's a tab you have to press on to allow the blower assembly to rotate and drop out of the dashboard housing. Mark the blower's position before rotating and removal to ensure correct re installation. Unplug the wires first and reconnect them last. I found an inductor very close to the motor frame covered in carbon brush dust with the dust bridging over to the motor frame - the dust might have been the culprit, as it is conductive. (Did a study on this at work in electronic circuit boards years ago using a microscope. It's strange, but true how dust can be a conductor and short things out. Took the pics then, solved the issue). I moved the inductor a little bit away from the frame after cleaning, don't scratch its coating. Make sure the alcohol has completely evaporated before reinstalling, you don't want a fire!
I wrote about this previously with how-to steps, see if you can search it up, but this is the general procedure of what I did.
Best,
Steve
Maybe try this to see if it is the issue. The brushes in my blower had lots of life left. There's a tab you have to press on to allow the blower assembly to rotate and drop out of the dashboard housing. Mark the blower's position before rotating and removal to ensure correct re installation. Unplug the wires first and reconnect them last. I found an inductor very close to the motor frame covered in carbon brush dust with the dust bridging over to the motor frame - the dust might have been the culprit, as it is conductive. (Did a study on this at work in electronic circuit boards years ago using a microscope. It's strange, but true how dust can be a conductor and short things out. Took the pics then, solved the issue). I moved the inductor a little bit away from the frame after cleaning, don't scratch its coating. Make sure the alcohol has completely evaporated before reinstalling, you don't want a fire!
I wrote about this previously with how-to steps, see if you can search it up, but this is the general procedure of what I did.
Best,
Steve
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mogulman (01-19-2023)
01-16-2023, 04:27 PM
#5
Super Member
Join Date: Jun 2021
Location: South Central Texas
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2014 GLK350 base model (active) ; 2001 E320 base (retired)
Great detailed response for a fix!
Personally, I'd use an electronic spray vs alcohol ... I use CRC Electronic spray (no, I'm not advertising or get a kickback
)
Personally, I'd use an electronic spray vs alcohol ... I use CRC Electronic spray (no, I'm not advertising or get a kickback
)
The following users liked this post:
Silver Shadow (01-16-2023)
01-19-2023, 10:04 AM
#7
When I replaced mine, I had trouble getting the new blower in. Seemed like it should just twist in, but wasn't that easy. It was getting stuck. I ended up opening my passenger door and removing some screws in the right side of the dash. This allowed the plastic to shift a little and then the blower rotated into place easier.
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01-19-2023, 10:58 AM
#8
I should be receiving the parts today... we'll see if as easy as the youtube vids ahow... (pull down on the tab with the arrow and twist clockwise )
thanks again.
Tom
)thanks again.
Tom
