why do the problems start now? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Thread Tools Search this Thread
Old 12-21-2004, 07:10 PM   #11
Senior Member
True Car Nut
Join Date: May 2002
Posts: 2,936
Thanks: 0
Thanked 0 Times in 0 Posts
sse1990 is on a distinguished road

If the temp is NOT staying at least above the 1/4 mark ( not the 40 mark) then your car is NOT holding the heat it should be holding. Usually that is almost certain that your stat is the problem. It seems like the stat is stuck open or that it is floating and not sealing properly allowing just enough fluid to get by and keep the engine colder than it should be.

So until you can get the temp to stay at that 1/4 to half mark I wouldn't bother with the heater core. Your heater core is not getting fluid that is hot enough to keep putting out the warm air.
sse1990 is offline   Reply With Quote
Old 12-21-2004, 09:49 PM   #12
Senior Member
Posts like a Camaro
padgett's Avatar
Join Date: Jul 2003
Location: Orlando, Florida
Posts: 872
Thanks: 0
Thanked 0 Times in 0 Posts
padgett is on a distinguished road

Neither the Bonneville or the TranSport ever make the 1/4 mark unless approaching 200F. 180F is just like the picture above shows, just under the 1/4 mark.
Guage is decidedly non-linear. Bottom line seems to be 100F, 1/4 is 190-200, 1/2 (straight up) is 220 and full is 260F (think red line is 250F). GM seems to feel that everything is OK at 220-230F.

Anything over 150F should produce decent heat but GM guages are so notoriously inaccurate that the only way to know what the ECM thinks the coolant temperature is with a scan tool.

Image is of 181F (is night so not clearest but if I use a flood or flash, the OTC 2000 display is invisible)
padgett is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
It died and won't start. Now have new motor and now this... '96BonnevilleL67 1992-1999 77 08-06-2007 06:50 PM
Problems, Problems, Problems... swartlkk 2000-2005 2 11-04-2005 08:57 PM
problems, problems, problems big_boss2010 1992-1999 15 04-25-2004 09:05 PM
why !!! why !!! why !!! rrounds 2000-2005 18 03-03-2004 01:39 PM
WHY WHY WHY?? bonnie94ssei Lounge 36 09-25-2003 05:53 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 Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 11:39 AM.

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.