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Low coolant or trapped air in the cooling system can cause gurgling noises, humming can be caused by debris like leaves in the blower motor squirrel cage (blower fan). You could check for debris before replacing the motor, when is out, turn it by hand to see if the bearings are rough. If the heat blows warm, no air is trapped. If the heat does not blow warm, check the coolant level and bleed the system if necessary. It might be a bad bearing in the heater fan motor. Does it go away when you change fan speeds? If so, replace the heater fan.

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โˆ™ 2007-10-20 13:33:39
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Q: Why would the heater-ac in a 2002 Buick Century make a humming noise?
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