In my 2006 Grand Prix I have a coolant leak, I just replaced the lower intake gaskets in March, the coolant elbows are Dorman Aluminum with AC Delco O rings.
Waterpump and thermostat was replaced 3 days ago....
All hoses were replaced a few years back with brand new AC Delco hoses.
It does not look like the leak is coming from the coolant elbows, so what else is under the pump that can leak?
I heard some GP'* have a engine block heater in that area, or a timing chain gasket could leak, shrugs..
I have done all I know to do and am at a loss, I can jack it up and remove the lower splash shield, then maybe I can see where it is coming from.
Work has kept me so busy that I have not had time to do so yet, I let a mechanic diagnose it and he said waterpump, well he was wrong..

Possibly (hiss) pressure testing the system may point to problem location?

you might try using a mirror to look underneath the pump and around it, flashlight too. helps me sometimes
I have a 2003 Park Ave with the 3800 and the block heater is in side of the block by the starter, for what it'* worth.

Agree.

Mirror and/or scope etc. to see where

Lots of light.

You can always use some UV dye.

I am sure it is not the waterpump, just replaced it the other day, because a mechanic I let diagnose it said waterpump, but the pump was fine, it appears to be right under the waterpump, near the block.
I think it is coming from my timing chain gasket, isin;t there a water port on both left and right of that side?
I will try to find a cheap pressure tester, and some mirrors and light, if anybody has any suggestions for mirrors or light please let me know.

I am sure I can do the timing chain gasket, but it will be so time consuming that I may have to let a mechanic do it..
If I were to do it is there anything else I should replace? Like timing chain, timing chain dampener, or crank sensor?

Hey WilliamE, I looked at my manual and under the water pump it didn't look like there were any water passages in the timing chain cover down there. but there is at least one on the right side of the cover up high as you're facing the engine. it'* where the bottom radiator hose goes in.
it would seem if the only place you see coolant is below the radiator it would be the water pump.
if it was coming from the timing chain cover, I would think you'd have coolant in your oil.

edit.
I meant if you see coolant below the water pump not radiator.

Yeah I am confused as well, but it is deff not coming from the water pump, I watched this video, granted it does not have a SC, but the block should be the same.
At the point I linked the video you can see coolant passages on the upper right and left of the timing chain.. and if the gasket failed under that right side, to right lower side of that coolant port, I could see it leaking, but not mixing with the oil yet...

The only other thing I seen mentioned that could be there in that area is a engine block heater, or maybe a freeze plug..
Whatever it is was hissing when the motor got up to 244F, and coolant was dripping off of my cross member, or whatever that main bar is below it, I could not see it at all...
I need to hurry up and find the leak, then decide if I can find time to fix it or not.

Thanks for the responses guys, I appreciate the help,

I wonder how well this would work..

Amazon

Amazon

Amazon

Amazon

Amazon

Amazon

Cannot find a good light that I want, but I am sure I can use a flood light from underneath the car or something,,
I still need something to pressurize the system, maybe I can find something from around 30.00