2011 Chevy HHR LT Humming Under the hood
Thread Starter
Joined: 08-09-2017
Posts: 5
From: Sacramento, CA
2011 Chevy HHR LT Humming Under the hood
Hello everyone, I have been having an issue where my car is making a "humming" noise coming from under the hood. It does it under idle and low load. If i step on it, it goes away. I cant seem to figure what it might be and i don't want to replace parts that aren't the problem. Has anyone had this issue before?
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Joined: 01-23-2009
Posts: 26,533
From: Fredericksburg,VA
Welcome!
My guess would be either the A/C compressor, the alternator or the belt tensioner. OR, if there is an exhaust smell look at the flex pipe
You can get an automotive stethoscope for about $3, or do the long stick to the ear thing.
My guess would be either the A/C compressor, the alternator or the belt tensioner. OR, if there is an exhaust smell look at the flex pipe
You can get an automotive stethoscope for about $3, or do the long stick to the ear thing.
Moderator
Joined: 05-01-2014
Posts: 8,512
From: California
Hello everyone, I have been having an issue where my car is making a "humming" noise coming from under the hood. It does it under idle and low load. If i step on it, it goes away. I cant seem to figure what it might be and i don't want to replace parts that aren't the problem. Has anyone had this issue before?
to the forums!!Yes, stethoscope or long handled screwdriver. I like the long funnel myself. Small end to the potential problem, big end to your ear. Maybe make a video and post it here so we can hear it.
Thread Starter
Joined: 08-09-2017
Posts: 5
From: Sacramento, CA
I will purchase one today. Its a high frequency squeal so its kind of difficult to pinpoint the source by ear for sure.
Thread Starter
Joined: 08-09-2017
Posts: 5
From: Sacramento, CA
Thread Starter
Joined: 08-09-2017
Posts: 5
From: Sacramento, CA
No it doesn't sound like a metal sound. No it does not change with RPM. It eventually goes away with a heavier load. So during idle, you can hear it. During light throttle, you can hear it. During heavy loads, it goes away. Pitch doesn't change. Its a 2.4 automatic.
Platinum Member
Joined: 12-06-2009
Posts: 11,721
From: Alabama
No it doesn't sound like a metal sound. No it does not change with RPM. It eventually goes away with a heavier load. So during idle, you can hear it. During light throttle, you can hear it. During heavy loads, it goes away. Pitch doesn't change. Its a 2.4 automatic.
My guess would be a PCV issue. Constant vacuum at idle and light throttle. No vacuum at heavier throttle the noise goes away. Maybe Donbrew can confirm my guess and tell you what to check.