overheating with AC on, and standing still - Page 4 - 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 07-25-2006, 07:45 PM   #31
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Has anyone tried installing a larger radiator in their Bonneville? Or maybe an electric water pump that could push more coolant, especially at idle?
jr's3800 is doing so right now. His failed and he received a larger Cadillac rad instead of the bonneville one he ordered.

jr's3800 Radiator Update
Wow, less than an inch thick. No wonder these things overheat.
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Old 07-25-2006, 09:18 PM   #32
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Originally Posted by lash
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Originally Posted by TheEngineer
Has anyone tried installing a larger radiator in their Bonneville? Or maybe an electric water pump that could push more coolant, especially at idle?
jr's3800 is doing so right now. His failed and he received a larger Cadillac rad instead of the bonneville one he ordered.

jr's3800 Radiator Update
Wow, less than an inch thick. No wonder these things overheat.
That depends... Its seems that the 96+ SSEi'* or SESC(SLE Package) 96-97 all came with a 1" Core... The NA'd versions got the smaller core...

The 92-95 SSEi should have had a 1 3/8" core, all of these came with HD cooling...

I have yet to check my 91 SSE with HD cooling to see what the core on it is...

So the SE'* for the most part got a skinny little core that wan't fit for anything... LOL
But I never really had any cooling issues even here in FL with the temps at 98-99F.. But I have run a 180F T-Stat the entire time I have owned the car... In motion it stayed nice and cool, in traffic it got a bit warm but nothing to worry about.. My 91 LE has the same Radiator as my 95 did... and it too stays pretty cool... But when the Radiator goes, it too will get an HD radiator

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Old 07-25-2006, 09:42 PM   #33
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Well if I can't get this to behave reliably with everything I've done recently, the next step will be a new radiator. I will definitely go to the 1" core since I think that is where it should be to start with. The L67 powered W bodies run a 1" core in on a slightly narrower radiator and I have had no issues with them even coming close to overheating. This skinny little thing in the Bonneville does alright in motion, but any kind of stop and go traffic is murder on it.

I have done some looking just to see what is out there and I found a 30.5" x 17.25" x 1" radiator for around $100 shipped off Ebay. Do these dimensions sound correct? I assume these cars have fittings for an internal tranny cooler as well, correct? And no oil cooler?
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Old 07-25-2006, 09:48 PM   #34
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Well if I can't get this to behave reliably with everything I've done recently, the next step will be a new radiator. I will definitely go to the 1" core since I think that is where it should be to start with. The L67 powered W bodies run a 1" core in on a slightly narrower radiator and I have had no issues with them even coming close to overheating. This skinny little thing in the Bonneville does alright in motion, but any kind of stop and go traffic is murder on it.

I have done some looking just to see what is out there and I found a 30.5" x 17.25" x 1" radiator for around $100 shipped off Ebay. Do these dimensions sound correct? I assume these cars have fittings for an internal tranny cooler as well, correct? And no oil cooler?
That looks to be the right size... But be careful or you may end up with tranny cooler line issues like me... The Radiator I got has fittings for 5/16 tranny line, and the ones on my car stock are 3/8 line... I was going to attempt to adapt to the tranny cooler in the radiator, but after some chatting it out I will do a full Bypass to the Aux Cooler I have...

Yes you car should have no provisions for an engine oil cooler or EOC, But the radiator you get should have provisions for the Trans cooler.. On my 95 SE I actually ran my AuX cooler in tandem with the internal radiator cooler..

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