Question about 2010 GMC Terrain

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Hear whining sound only when heater is on.

I have a 2010 GMC Terrain 2.2L - - for the last 2 days (only) I'm hearing a whining noise that starts slow and increases in volume only when the HVAC is on. It sounds like the engine or transmission but when I turn off the heater the sound stops. Any suggestions?

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  • Master
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Is it the heater fan making the noise? Some can be lubricated, others have to be replaced. I hope this is helpful.

Posted on Apr 01, 2014

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SOURCE: Clicking sound on passanger side of '04 GMC Envoy

most likely the blower motor squirrel cage hit the fan housing or the motor has a damaged bearing from the impact, the noise is coming from the fan which is on the passenger side, pull the fan assembly out and see if the blower cage is damaged, if it spins true then replace the blower motor, not a very hard job.

Posted on Feb 09, 2009

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SOURCE: Ticking sound

Gm will tell you this is normal lifter noise if it from the top of the motor. It could be from the exhaust but you would hear it from under the car more. I do not care for the responce from GM but they say it is ok.

Posted on Mar 01, 2009

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SOURCE: whining noise when the engine running

Yep, That was it. i followed a link to trailvoy.com and found a video with the same noise and links to how to repair. My husband fixed it yesterday and the noise is no more!! Good Luck..

Posted on Apr 26, 2009

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SOURCE: 2004 GMC Yukon Denali Awd humming sound in front of truck

The Denali's are really susceptible to front dif. wear and failure. Because it is AWD, the front dif is always working unlike a 4WD. GM, in order to lighten up the front end built the front dif in aluminum. If it was the same as the rear, it would be bullet proof, but much heavier. After about 80,000 miles it is common to have bearings failing. Remove the drain plug which happens to be magnetic. You may see more than just the normal fine filings. You will likely see larger chunks of metal some of which is not even magnetic but will drain out with the oil. You are likely looking at a $1500 rebuild. It will get much louder and run for a long time before it really goes south.

Posted on Jun 21, 2009

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SOURCE: 2002 gmc sierra denali rear axle noies

I have a 2002 Sierra Denali, and when it was only two years old, I began having the same issue that it sounds like you guys are describing. Luckily, I had opted for the extended warranty, because it turns out that the lube "specialists" at Wally-World had topped off my rear differential with standard rear-end oil. I turns out that the Denali's differential has a special "clutch pack", as they called it, that requires a secial, senthetic (aka: very expensive) lubricant. The **** WalMart added contaminated the diffy's oil, and caused the clutch pack to fail.... basically it started locking the rear axles, and not allowing one side to rotate at a different speed than the other, as is required in turning.
Well, it took the dealer nearly a month to acquire the neccesary parts for the repair, and as for the cost? Only a minimal deductible, and the dealer assured me that the $1800 extended warranty had paid for itself.... nearly twice!!!
WORDS OF ADVICE: If you own a Denali with AWS, Always instruct the lube guys not to touch your rear differntial! And have your certified GM mechanic check it at recommended intervals.

Posted on Nov 03, 2009

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