I have a 2003 Chevy Blazer. When I drive I hear water, seems the sound is coming from the front of the vehicle, mainly on the passenger side. I looked under the vehicle to see if there is any clogged drains, but couldn't find a drain. Tryed to look into the cowl area and appeared dry. This is driving nuts. Any insights would be helpful.

 

It's your heater core.
It's either gunked up with sludge and/or you have air trapped in your cooling system.

https://blazerforum.com/forum/tech-a...e-flush-51751/

 

^^^^
Yes....heater core is the cause. If you fill the system and the noise comes back you have leak somewhere in your system....rad cap...hose leak....core going bad.

 

I check the heat yesterday. The heat coming out of the vent was very hot. So yes I have heat, plenty of it. So my other guess is air in the system. Could it be possible that coolant is leaking out and being contained?

 

You have air in the system! Like was explained in your other thread concerning this issue you need to get the air out of the cooling system and the noise you are hearing will go away. It has happened to me three times after flushing my system and it just takes patience to let it run and flush all of the air out in the way it was explained by chcknugget on your other thread. Go do that and you will be done with this issue!!

Just so everyone knows which thread I'm refering to https://blazerforum.com/forum/2nd-ge...ld-i-do-73420/