Strange Noise at first acceleration

Sorry, I meant to ask if anyone had suggestions on what it could be.

Hmmm so your saying that its idling high while sitting and when start driving it goes away? If thats the case its prob just a vacuum leak somewhere. Check all the rubber hoses for cracks/ damage.

Did you figure this out? I have a 2002 Blazer with almost 54,000 miles and for the past 2 months have had the same issue. It's only in first and sometimes 2nd gear. Once it shifts into 3rd it's quiet again. It's almost always when I get in to drive after its been sitting for a few hours or more. And sometimes it makes the sound after I've been on the road for an hour or more as I stop and accelerate again. Mechanic has had it for 2 days (tomorrow will be 3) and I'm getting frustrated.

fan clutch is going bad

I agree with Kevin. Our 2003 trailblazer apparently had a bad fan clutch, it desenigrated and too out the hood liner, punctured the washer fluid tank, the belt, water pump and the shroud. Poked holes in the hood to. after 1600 $ at a good local repair shop, the noise is no longer there. By the way, the clutch was about 400$. and it going bad, took out the thermostat a month later. ( which is why I am on this site today, looking for installation help.) I would urge you to replace the fan clutch ASAP. Its electric by the way. Good luck!

It's the air conditioner compressor clutch I had the same problem with my 2003 Blazer you need to replace the air conditioner

I had a 06 trailblazer same problem the solution for me was cleaning the throttle body

I HAVE A 2004 CHEVROLET TRAILBLAZER AND IT IS MAKING A NOISE ON THEGRILL WHAT CAN CAUSE THAT

I have the same problem with my 2004 Trailblazer. I have replaced the fan clutch and the air conditioner does not work. Guess I will clean the Throttle body. I was concerned it was the transmission because it only makes the roaring sound when moving and then only in 1st gear and sometimes 2nd.

I do not what to do with my 03 Trailblazer , it has a wear noise where transmission and motor meet , is like metals are loose inside I just picked it up after redoing the trans.. and still has the noise

have a question my 03 trailblazer is making a weird noise even after rebuilding the trans. and it also vibrates too much it is a bummer not to know what it is . could someone advice me what to look for

I haad/have the exact same problem. The air conditioner works well (not great) but when I first start the car, until I get past the first gear change, the fan is on full blast. Once it gets going over 20 mph ,it disappears. I replaced the clutch fan, and this still occurs.