Where are the drain plugs on the Engine Block? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 08-11-2006, 01:16 AM   #1
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Default Where are the drain plugs on the Engine Block?

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
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Old 08-11-2006, 09:09 AM   #2
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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
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Old 08-11-2006, 09:19 AM   #3
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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
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Old 08-11-2006, 09:26 AM   #4
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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.
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Old 09-21-2006, 01:33 PM   #5
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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.
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Old 09-21-2006, 02:15 PM   #6
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Knoking the dust off this one Mike?
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Old 09-21-2006, 03:45 PM   #7
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Old 09-21-2006, 11:56 PM   #8
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was only August and I just looked into the same thing. Nothing in Techinfo on this. Maybe we should add the info. for clarity.
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