Black Coolant - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

Go Back   GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat > Pontiac Bonneville > 1992-1999

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.

LinkBack Thread Tools Search this Thread
Old 04-22-2007, 01:25 AM   #1
Senior Member
Posts like a Turbo
ohenry5's Avatar
Join Date: Nov 2006
Location: Springfield, MO
Posts: 463
Thanks: 0
Thanked 0 Times in 0 Posts
ohenry5 is on a distinguished road
Default Black Coolant

Should have checked with you guys sooner but just thought of this after looking at another thread. I know the whole coolant, LIM/UIM, has been discussed over and over, but when I got my 30,000 mile service done they flushed the coolant and said it was black. Mind you I am not losing any coolant at all and dont smell it. Checked exhaust and is not sweet or anything. Are my intake manifolds leaking already? I know the Dex turns brown a lot and all but never heard anything about it turning black??!! Help is appreciated.
ohenry5 is offline   Reply With Quote
Old 04-22-2007, 01:38 AM   #2
Senior Member
True Car Nut
Join Date: Mar 2004
Location: Ames, Iowa
Posts: 3,066
Thanks: 0
Thanked 1 Time in 1 Post
bill buttermore is on a distinguished road

What usually turns coolant black is when someone adds green phosphate coolant (hard to find nowadays) to Dex-cool. The two types don't play well together.

And....the time to replace your LIM gaskets and UIM is BEFORE you have any symptoms. Especially in a nice collector car like yours. This is more important in 1995-1998 models where the plastic EGR passage in the UIM is more likely to fail because of the larger stovepipe used. If you haven't already done so, please take the time to read this: Just my $.02.

1995 SLE
bill buttermore is offline   Reply With Quote

Similar Threads
Thread Thread Starter Forum Replies Last Post
Poll: Black rims for Black 06 GP SAMzGXP General GM Chat 7 01-17-2010 09:52 PM
faulty Low Coolant indicator: alternate coolant a cause? dimprov 1992-1999 6 10-24-2005 10:57 AM
Little Black Box....Good or Bad? SSEi95 General GM Chat 18 02-13-2003 12:07 AM
Black leather interior, please help!!! ly41181 General GM Chat 5 01-08-2003 03:59 PM
The 92 Black Bonnie I bought is missing.... kimmers 1992-1999 0 10-28-2002 08:44 AM

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 02:57 AM.