11-29-2007, 07:16 PM
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#1
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AF Newbie
Join Date: Nov 2004
Location: galveston, Texas
Posts: 82
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What could cause a loud vibrating noise when the ac is on?
My ac has just started to make this very loud humming vibrating noise when its on especially when I turn it on max.The gas pedal even vibrates a little bit....there is only one setting that doesnt make any vibration at all.It still blows very cold.It has always made some weird kind of noise when the ac was on but mostly just when i turn the wheels...it never really bothered me that much but this is just continuous no matter what....any help would be appreciated.
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11-29-2007, 07:39 PM
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#2
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AF Moderator Elite
Join Date: Feb 2005
Location: Sea Island, Georgia
Posts: 4,563
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Re: What could cause a loud vibrating noise when the ac is on?
Does the vibrating and humming vary in intensity if you increase/decrease fan speed?
__________________
Knowledge can be communicated, but not wisdom! “Ye shall know the truth and the truth shall set you free."
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11-29-2007, 08:44 PM
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#3
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AF Newbie
Join Date: Nov 2004
Location: galveston, Texas
Posts: 82
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Re: What could cause a loud vibrating noise when the ac is on?
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Originally Posted by HotZ28
Does the vibrating and humming vary in intensity if you increase/decrease fan speed?
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exactly....if I have it low you can barely hear it and cant feel anything but when I turn it all the way up its like an airplane is landing in my front seat....and you can feel it on the pedals...
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11-29-2007, 08:47 PM
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#4
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AF Moderator Elite
Join Date: Feb 2005
Location: Sea Island, Georgia
Posts: 4,563
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Re: What could cause a loud vibrating noise when the ac is on?
You need to replace the blower motor, the bearings are worn out in your existing motor.
__________________
Knowledge can be communicated, but not wisdom! “Ye shall know the truth and the truth shall set you free."
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11-29-2007, 08:59 PM
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#5
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AF Newbie
Join Date: Nov 2004
Location: galveston, Texas
Posts: 82
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Re: What could cause a loud vibrating noise when the ac is on?
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Originally Posted by HotZ28
You need to replace the blower motor, the bearings are worn out in your existing motor.
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thanks for the info...and would you know about how much that is? And is it ok to keep it running on low till then or will I blow myself up some how?
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11-29-2007, 09:33 PM
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#6
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AF Moderator Elite
Join Date: Feb 2005
Location: Sea Island, Georgia
Posts: 4,563
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Re: What could cause a loud vibrating noise when the ac is on?
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Originally Posted by persuazion
thanks for the info...and would you know about how much that is? And is it ok to keep it running on low till then or will I blow myself up some how?
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We need to know the year of your car and if you have auto climate control (ACC) with digital display, or do you have the manual system; then we can answer these questions. 
__________________
Knowledge can be communicated, but not wisdom! “Ye shall know the truth and the truth shall set you free."
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11-29-2007, 09:37 PM
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#7
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AF Newbie
Join Date: Nov 2004
Location: galveston, Texas
Posts: 82
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Re: What could cause a loud vibrating noise when the ac is on?
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Originally Posted by HotZ28
We need to know the year of your car and if you have auto climate control (ACC) with digital display, or do you have the manual system; then we can answer these questions. |
sorry I have a 99 lesabre and it just has the manual system....
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11-29-2007, 10:45 PM
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#8
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AF Moderator Elite
Join Date: Feb 2005
Location: Sea Island, Georgia
Posts: 4,563
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Re: What could cause a loud vibrating noise when the ac is on?
This one is a "Factory Air brand from Advanced/Parts America & cost $47.77. It does include the blower wheel. Since you have the manual system, it should be OK to run the fan on low until you get a new one. (Don't wait too long) The reason I ask about it being ACC or manual is; the ACC system uses a blower control module to vary voltage to the blower motor. If the motor is failing, it is pulling higher amps than normal and can cause the module to fail. These modules cost about 190 bucks now at the dealer! 
__________________
Knowledge can be communicated, but not wisdom! “Ye shall know the truth and the truth shall set you free."
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11-29-2007, 10:53 PM
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#9
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AF Newbie
Join Date: Nov 2004
Location: galveston, Texas
Posts: 82
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Re: What could cause a loud vibrating noise when the ac is on?
Quote:
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Originally Posted by HotZ28
This one is a "Factory Air brand from Advanced/Parts America & cost $47.77. It does include the blower wheel. Since you have the manual system, it should be OK to run the fan on low until you get a new one. (Don't wait too long) The reason I ask about it being ACC or manual is; the ACC system uses a blower control module to vary voltage to the blower motor. If the motor is failing, it is pulling higher amps than normal and can cause the module to fail. These modules cost about 190 bucks now at the dealer!
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ok thanks alot for the help....one more thing.Where is this part located at on my car just so I know.Thanks again
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