Slight knocking sound when I turn my 2007 Saturn Aura.

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Diagrams and Videos

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google 2008 saturn aura xr v6 3.6 serpentine belt diagram

copy and paste

https://www.gmpartsclub.com/v-2008-saturn-aura--xr--3-6l-v6-gas/maintenance-and-lubrication--belts-and-pulleys

You need to fix the coolant leak, then refill and bleed cooling system, then you will get heat and cure overheating problem too

PDF]2007 Saturn AURA Owner Manual

www.saturn.com/.../saturn/.../2007/aura/2007-saturn-aur... Saturn Corporation2007 Saturn AURA Owner Manual M. 1 ... trademarks, and the name AURA is a trademark ... Warning Lights, Gages, and Indicators in ..... Get it up to speed.

I have a 2007 Saturn Aura with 3.6 L engine. Had it since new (now at 55,000mi) Here is what I found that may be what you are experiencing. Particularly in cold weather, after about 5 minutes of running a sharp "pop" occurs. Usually I just have one loud pop. I believe this is something in the exhaust system that expands and pops much like a cookie sheet put into the oven. As best I can tell, this is a harmless noise. As the car has gotten older it does this less frequently.
Dave K.

it could be the front stablizer links are worn out

Probably one of your rod bearings is going out and knocking when under load. Get it fixed before it stops completely.

check oil plug for metallic substance.may have spun baring.now that is only a Thoth. don't panic.dos it knock loudest at beginning of start.

get it back to the dealer still under factory warranty

could be wheel bearing.. could be rotor or brakes..replace them all.. do it yourself save a grand. under 3 hours work.. even if 4 hours thats a big savings.