Ok i have a question my 2010 cobalt ss/tc has a whining noise on cold starts only after 20 seconds the noise goes away! It reminds me of a bad alternator bearing but i don't think thats it! Any ideas? The car has 48k miles on it! And it does have a cai buy hahn and a cated diwn pipe by zzp ! Thanks for any info

 

You aren't talking cat warmup mode right? Please don't be talking about cat warm up mode.

Can you get us a video?

 

Hey there oramtrap,

I’m sorry to hear that your Cobalt experiences this noise. I cannot guarantee anything, but I will be glad to look further into this for you. Please send a private message referencing this thread if any extra assistance is needed. Thank you.

Kristen A.
Chevrolet Customer Care