2010 Chevrolet Avalanche AC/heater

BBLYDEN

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2010 CHEVROLET AVALANCHE
5.7L
V8
2WD
AUTOMATIC
35,000 MILES

They ac was working just fine I. I made a stop at a store and when I started the car again the ac was making a loud rumbling noise like it was trying to hard or something was stuck inside. I turned up the heater to help isolate the problem but it is the same result in bot heat and ac. I am thinking it is the blower motor or the resistor relay but not 100% sure.

7 Replies

JACOBANDNICKOLAS

MECHANIC
109,755 POSTS

Is the noise coming from the passenger side under the dash?

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Wednesday, June 25th, 2014 AT 7:55 PM

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4 POSTS

That is what it sounds like. I can feel a slight vibration when I place my hand in that general area. It also gets louder and I turn the ac to its higher fan setting.

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Thursday, June 26th, 2014 AT 4:07 AM

JACOBANDNICKOLAS

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109,755 POSTS

Either something has come loose or the fan motor is bad. Since the vehicle is so new, I would try to get consideration from GM because part of the dash needs removed to access the motor.

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Thursday, June 26th, 2014 AT 7:04 PM

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Thank you very much. I have one last question is it just the bottom part of the dash near the floor or will the upper dash need to be removed also.

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Thursday, June 26th, 2014 AT 7:55 PM

JACOBANDNICKOLAS

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109,755 POSTS

If you remove the lower section and the glove box, you MAY be able to get into it. Not sure where you live, but there is even a chance that some mice got in there and built a nest.

Let me know how things work out for you.