Hey guys, I recently noticed water running sound when I star my car.
I recently replaced the coolant reservior bottle after it leaked.

What could be the reason for such noise?

It goes away eventually after I drive for couple mins.

 

you are going to be flamed for this post....

firstly, wrong area, secondly the guys on here are good, but not psychic (although some probably think they are! :P ). we neeeeeed more information.

Ill Start:

What is the year car?
how many miles?
Auto/Manual?
where is the noise coming from? (front of the engine, back, side?)
Can you take a video?
Take a photo of the location?
recent maintenance apart from coolant reservoir?
had a mechanic look over it?
is the noise consistant?
how long after you start your car when it turns off?
Does the noise go away if you put your foot on the clutch(If manual)

 

Not really sure, but if it goes away, then it's all good. The problem is if the noise does not go away, then that's a problem.

 

So if an explosion happens under your hood, but only for a second, and the noise stops, it's fine then right?

 

lol...

 

It's the sound of coolant moving around. Check the coolant level, mine would make the same noise and I was a bit low on coolant.

 

there is a reason why one of the first recommendations when joining the forums is to block said user.