well summer is winding down and my cooling system is running off plain old water i need to put some colant in my system before it gets cold out. Now i want to drain the cooling system completely from the radiator to the block. i cant find these damn drain plugs on the block where are they? any pics and input would be helpful thanks

I never noticed any while taking photo'* of the 3800, but you probably could knock out the freeze plugs and drain it that way. Don't think they cost that much. Have a look at the pics.
http://www.bonnevilleclub.com/forum/...ic.php?t=60281

theres no need at drain all of it, your best bet would be just to flush the block with fresh water, and refill with a 50/50 mix

If you want to drain 95% of the fluid from it.. pull your knock sensors.. those are nearly the lowest possible items on the water jacket.

the older 3800'* did have drain plugs front and back and the series ll has sensors in these locations. So like Bill said you have to remove a sensor.'
The Stealership will like to tell you it has to be put on a special flush machine for a whopping $165 that does everything automatically.

Knoking the dust off this one Mike?

was only August and I just looked into the same thing. Nothing in Techinfo on this. Maybe we should add the info. for clarity.