AC blower motor? Problem?
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Joined: Jul 2016
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Mercedes Benz C300 2011 Sport
AC blower motor? Problem?
Hello, i have a Mercedes c300 2011, and just recently when my AC is on, my car will sound very... electronic? You hear a winding sound from inside the cabin, but if i floor it, it goes away and you hear the engine rev and not the winding. If you turn off the AC, you dont hear the winding at all.
When i got my oil change a few days ago, a mechanic said he thinks its my AC blower motor? I think?
Also, the fan, behind the grille, is loud. Normal?
After some research, its not the fan that makes the car sound loud when i turn it on, it literally, winds when i push down the gas ONLY when the AC is on.....
any ideas from you guys? Thanks
When i got my oil change a few days ago, a mechanic said he thinks its my AC blower motor? I think?
Also, the fan, behind the grille, is loud. Normal?
After some research, its not the fan that makes the car sound loud when i turn it on, it literally, winds when i push down the gas ONLY when the AC is on.....
any ideas from you guys? Thanks
Last edited by Paxx; Jul 6, 2016 at 02:09 PM.
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Joined: Oct 2015
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c300 Sport
Your descriptions are a bit hard to follow but I'm focusing on your last statement.
"After some research, its not the fan that makes the car sound loud when i turn it on, it literally, winds when i push down the gas ONLY when the AC is on....."
This could very well be the belt tensioner. With a load, it may sound louder. I would think you would hear it however with or without the AC on to some degree. The blower motor can also make a sound if the internal bearing is failing. This should be easy to pinpoint when engaging/disengaging the fan operation. The fan behind the grill will be loud depending on the rpm of the blades which in turn is effected by head pressure of the system. That sounds normal to me.
"After some research, its not the fan that makes the car sound loud when i turn it on, it literally, winds when i push down the gas ONLY when the AC is on....."
This could very well be the belt tensioner. With a load, it may sound louder. I would think you would hear it however with or without the AC on to some degree. The blower motor can also make a sound if the internal bearing is failing. This should be easy to pinpoint when engaging/disengaging the fan operation. The fan behind the grill will be loud depending on the rpm of the blades which in turn is effected by head pressure of the system. That sounds normal to me.
Thread Starter
Newbie
Joined: Jul 2016
Posts: 6
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Mercedes Benz C300 2011 Sport
I just tested it again, and this is how it goes.
I turn my car on, get in and pull out to a stop. When i gassed it with the AC on, it made the noise.
When i gassed it without the AC button on, but the regular fan on, it was not as loud, wasnt sure if i was hearing it or not actually.
When all is off, no sound. Just the benz rev.
But it only happens when i am pushing the gas, never at a standstill.
I turn my car on, get in and pull out to a stop. When i gassed it with the AC on, it made the noise.
When i gassed it without the AC button on, but the regular fan on, it was not as loud, wasnt sure if i was hearing it or not actually.
When all is off, no sound. Just the benz rev.
But it only happens when i am pushing the gas, never at a standstill.
