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 Post subject: Coolant disappearing
PostPosted: Wed Dec 27, 2017 3:06 am 
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Joined: Wed Jun 15, 2016 11:14 pm
Posts: 30
Location: NE Ohio
Year and Trim: 2000 Bonneville SSEi
I have a 2000 SSEi and recently I started having an issue where it would overheat by like 5° and then the heat wouldn't work. But after a bit of driving it'd go back to normal. I had no idea why it couldn't seem to make up it's mind but being a broke college student I let it go. More recently it started actually overheating. One day going down the highway it jumped to 280° and I quickly pulled off. Come to find out it's super low in coolant so I dumped 2 gallons into it and bled some air out the thermostat nipple. Day later it overheats again. And I find the radiator practical empty again. I have no idea where it's leaking from, I had my mechanic replace a few major gaskets a while ago due to coolant leaks. Tomorrow if I can remember how, I'll attach a couple pics of where it was smoking from and also where it seems to be wet. It's right below the exhaust pipe from the front header where it goes over top the transmission.


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 Post subject: Re: Coolant disappearing
PostPosted: Wed Dec 27, 2017 9:15 am 
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Posts like an L67
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Joined: Sun Aug 22, 2010 11:11 pm
Posts: 1588
Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
sounds like its in the throttle body area... look carefully around the thermostat - did you close the nipple?
start the car and fill coolant - bleed and you will see the leak once the system is pressurized.

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 Post subject: Re: Coolant disappearing
PostPosted: Wed Dec 27, 2017 10:33 am 
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Joined: Wed Jun 15, 2016 11:14 pm
Posts: 30
Location: NE Ohio
Year and Trim: 2000 Bonneville SSEi
96 SSEi wrote:
sounds like its in the throttle body area... look carefully around the thermostat - did you close the nipple?
start the car and fill coolant - bleed and you will see the leak once the system is pressurized.

Yes nipple is closed. I will check the throttle body area when j get off work today. Is that a gasket that could be replaced myself? Or does it require a mechanic


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 Post subject: Re: Coolant disappearing
PostPosted: Wed Dec 27, 2017 1:49 pm 
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Posts like an L67
Posts like an L67

Joined: Sun Aug 22, 2010 11:11 pm
Posts: 1588
Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
if its just the tb, hose, egr , plenum, then no - you would need about a 5 out of 10 in skill and standard tools.

first you find the leak - see if its pooling and draining on the thermostat side or actually leaking from there.

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poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am


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 Post subject: Re: Coolant disappearing
PostPosted: Thu Dec 28, 2017 4:41 am 
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Posts like an L67
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Joined: Thu May 01, 2014 9:37 pm
Posts: 1277
Year and Trim: 1993 SLE
1998 SE
2001 SSEI
2002 SSEI
You really have to pinpoint it.
You can borrow a cooling system pressure tester for free for some parts stores.
This is how mechanics most often check for leaks.
With the system full, pressurize the system to no more than 15 lbs and see where coolant comes from.
There's also the engine coolant temp. sensor, the supercharger to LIM gasket, the side cover of the LIM and the LIM gasket itself as potential leak points.
An overheat that caused a 2 gallon coolant loss in a day shouldn't be difficult to see.
Check for coolant in the oil, since failed LIM gaskets can put coolant into parts of the engine where it doesn't belong.
The oil will look like a chocolate milkshake if there's coolant in it.
If this is the case, then the gasket must be changed without delay and the oil too before it ruins the bearings.

Don't keep driving the car, as the overheating can ruin the head gaskets, making for more repairs.
Hopefully, this has not already occurred.


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 Post subject: Re: Coolant disappearing
PostPosted: Fri Dec 29, 2017 6:02 pm 
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Joined: Fri Jun 24, 2016 12:15 am
Posts: 511
Location: Isanti, MN
Year and Trim: 2000 SLE Saved from the scrapyard.
Be mindful that there is a gasket/crossover between the engine and transmission that could be a possible culprit ( Andrew picked up a Bonneville for cheap because the repair was more than the car was worth to the owner. ) there's a small opening near the top of the transmission bell housing that you would want to look at for coolant, as well as seepage between the engine/transmission underneath.

This would be a worst case scenario. Don't rule out the Lower intake gasket though, even if they were replaced...as mentioned, a coolant pressure test in this case will prove invaluable.

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