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
109,700 POSTS

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

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

BBLYDEN

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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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109,700 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

BBLYDEN

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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

MECHANIC
109,700 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.