Coolant looks yucky - Page 2 - 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 05-31-2005, 06:10 PM   #11
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Nothing wrong with straight water. I did it. Ran the car for 100-some miles. Nothing wrong with my cooling system after that, and sitting for ~7 months with just water sitting at the bottom of the block [I will admit there was some rusty coloured water at first, but it all came out after a few minutes with the hose]. I don't have any liquid in my cooling system as-of-yet, but at first I know I will be running just water. Can't really afford Anti-freeze, so if it leaks, I leak water, not precious [to me] anti-freeze.

Since the SSEi has a better Radiator [I assume], I would try to grab one from an SSEi. Since you will have the engine out, you may as well pull the radiator at that point, and compare it to that of one from a SSEi, perhaps they are the same? Probably not. But yeah, I vote replace the radiator.


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Old 05-31-2005, 06:16 PM   #12
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Nothing wrong with straight water. I did it. Ran the car for 100-some miles. Nothing wrong with my cooling system after that, and sitting for ~7 months with just water sitting at the bottom of the block [I will admit there was some rusty coloured water at first, but it all came out after a few minutes with the hose]. I don't have any liquid in my cooling system as-of-yet, but at first I know I will be running just water. Can't really afford Anti-freeze, so if it leaks, I leak water, not precious [to me] anti-freeze.

Since the SSEi has a better Radiator [I assume], I would try to grab one from an SSEi. Since you will have the engine out, you may as well pull the radiator at that point, and compare it to that of one from a SSEi, perhaps they are the same? Probably not. But yeah, I vote replace the radiator.


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I'm thinking you haven't seen the car in question...
http://www.bonnevilleclub.com/forum/...237&highlight=
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Old 06-01-2005, 10:56 PM   #13
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Originally Posted by Flatlander
I have had considerable bad experiences with Dex-Cool in my Sonoma truck also in my sister'* GMC Jimmy. In both cooling systems the Dex-Cool turned really muddy and into sludge that plugged up the heater cores. After numerous flushes and cleaning according to the GM cleaning procedures still had problems. Put in the conventional anti freeze in both a couple of years ago and had no problems since. Do a serch on google and check out Dex cool problems. There are very many people with the same problems with Dex-cool and even class action suits in progress against GM for these problems. I would sooner have to go back to the regular coolant servicing schedule than deal with the problems of Dex-cool supposed extended life service schedule.

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The following is a quote from a GM powertrain engineer re: Dex-Cool.

"The DexCool is not harmful to the system and will not wreck coolant systems. It is running in WAY too many cars perfectly fine (including a LOT of 4.3 V-6 engines) for it to be a disaster. I have personally seen a GREAT deal of testing on the DexCool product before and after it was released from production and it has always performed admirably. There have been engines from livery service run to 250K and 300K with DexCool and the cooling systems, water pumps, coolant jackets, etc....look like brand new. DexCool works fine.

When there are cooling system problems the findings continue to point to lack of cooling system maintenance and lack of keeping the system full as the root cause of the problems that have been experienced with DexCool. There have also been some failures due to installation of un diluted DexCool where the owner thinks that straight coolant is "better" then the required 50/50.

DexCool will not eat the impeller off a water pump.....!!!! Not sure how to do that other than running the system low or clogged and causing severe cavitation in the water pump....or maybe running straight DexCool causing a more acidic mixture and greater viscosity and more cavitation.

The reaction in the 4.3 V-6 engines is a bit different in that the engines have a cast iron block and heads. The DexCool does not provide corrosion protection for the cast iron when the system is low and the head surfact inside the coolant jacket dries out . It rusts, the rust then gets washed into the coolant and eventually it gets bad enough that the rust particulates start to plug the system and/or unseat the seal of the pressure cap causing the system to loose pressure and boil easier.

No coolant is perfect. The silicated coolants are somewhat abrasive and cause premature water pump seal wear in some situations. The silicated coolants also gel with time and lack of activity which leads to plugged heater cores and such. Silicated coolants also deplete with time as the silicates are sacrificed to plate the surfaces so they need to be replaced.

DexCool provides very long life...very long corrosion protection since there are no silicates to plate out and disappear. The DexCool needs to have the system full to completely protect any cast iron in the system and prevent rust from occurring. DexCool is also acidic (by design) so if it is not diluted and installed in a 50/50 mix it can also cause problems...including heater core and radiator damage if the coolant is not diluted correctly.

Over the long haul there are significantly less cooling system problems and engine failures due to lack of cooling system maintenance with DexCool than with the previously used conventional silicated coolants. You have to take into account ALL problems including water pump seals, head gasket failures due to corrosion, etc...."
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Old 06-01-2005, 11:02 PM   #14
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well over 7 years of ownership, and I have not had 1 single issue with dex cool...

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Old 06-01-2005, 11:11 PM   #15
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Neither have I on a '96 Bonneville and a '97 Deville, both over 100K.
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Old 06-01-2005, 11:16 PM   #16
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I make sure its full... Never let it run down, ever...

I know of several people that almost never check the coolant or oil... This is how my friend ends up working on peoples cars... Low on coolant but had no idea... Poof there goes the head gasket/* ..... If they would have simply looked to see the system was full it wouldn't have been a problem...

The last 3100 he worked on was a 97 with 180,000 miles on it... It had dex all of its life... The intake gaskets finally failed, the lady ran it hot and killed the head gaskets... 180,000 and I have seen soo many reports of people blaming dexcool for their problems...

Sad part is that I have seen the Green coolant in a 3100 with the exact same results... Some before 100,000 some after 150,000 miles...

I'm just really pissy about the whole green vs dex cool thing I guess...

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Old 06-02-2005, 11:37 AM   #17
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I see in a previous post quoting the GM'* engineer that the problems with the 4.3 liter engine is because dex cool does not provide protection for cast iron cyl block and heads. What do you think our boneville engines have? are they not cast iron block and heads also? Another thing he states that the coolant should never be allowed to go low. On both of the 4.3'* I am talking about the coolant levels in the overflow tank always showed full and were never allowed to drop below the cold line. Friends of mine that own an independent garage have also seen problems with dex-cool plugging up systems. Maybe it is okay in aluminum blocks and heads but I will see how my parents 03 Cavalier'* cooling system lasts.

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Old 06-02-2005, 12:00 PM   #18
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First this is not going to turn into a debate...

I know what my Bonnevilles have... Yes I know they are cast iron block and heads...

And just because the overflow is full doesn't always mean that the Radiator/Block is full...

I will continue to use Dex In my 95... I have had no issues... I know people at 150,000-200,000 on dex and they to have had not 1 single issue...

Dex cool does not have silicates that adhere to alluminum or cast iron for that matter... Dex will only protect what it actually touches, if an air pocket develops or the air is not blead out of the system then it will become a problem...

The only time I have ever seen Dex Cool sluge in a system is when Green was mixed with it, and the coolant was not Dex Cool compatible..

As I stated eariler we tore down a 3100, Cast Iron block and alluminum heads... It had no sludge in it at all and was at 180,000 miles with Dex Cool...

I have said this a million times, I will take the chance and keep the Dex... I have never had any problems... My radiator and all major items look like new, even the thermostat comes out looking like new...

If you or anyone does not feel comfortable with Dex, then its simple... Flush the system and go to green...

All I can say is that people are going to do what they feel comfortable with... What ever gives them piece of mind... Thats fine and thats the way it should be..

I do not demand that people use Dex, nor will I stop them if they want to... They will do what they feel correct in doing... If they look at all of the research and decide aginst it, thats fine.... If they still want a long life coolant I'll most likely point them in the direction of Prestone Longlife or another simmilar brand... I have Prestone Longlife in my 91 as I didn't want to do a full flush to swap to dex cool... So I just grabbed the Longlife and went with it...

I really don't care what coolant anyone uses, as long as they keep an eye on the coolant level, and that includes checking the radiator to make sure its full as well... And after so many years it may also be a good idea to replace the Radiator cap as well...

I guess I'm saying to each his or her own...

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Old 06-02-2005, 12:44 PM   #19
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I make sure its full... Never let it run down, ever...

I know of several people that almost never check the coolant or oil... This is how my friend ends up working on peoples cars... Low on coolant but had no idea... Poof there goes the head gasket/* ..... If they would have simply looked to see the system was full it wouldn't have been a problem...

The last 3100 he worked on was a 97 with 180,000 miles on it... It had dex all of its life... The intake gaskets finally failed, the lady ran it hot and killed the head gaskets... 180,000 and I have seen soo many reports of people blaming dexcool for their problems...

Sad part is that I have seen the Green coolant in a 3100 with the exact same results... Some before 100,000 some after 150,000 miles...

I'm just really pissy about the whole green vs dex cool thing I guess...
JR..I was helping Mechanic Dan change motors for a quite a while and this one truck we did... guy changed radiator, hoses, tstat...and the list goes on...motor blew..we changed it..he wanted to save money and asked us to use the old water pump along w/other stuff.... we finish up and are adding the fluids...somethings leaking bad. Both look at each other with the "What didn't you hook up and check twice" look. Coolant was pouring out the weep hole...

Moral of the story..moron blew a motor cause he didn't keep the rad full. Also couldn't diag a leaking waterpump....
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Old 06-02-2005, 12:50 PM   #20
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Quote:
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Quote:
Originally Posted by jr's3800
I make sure its full... Never let it run down, ever...

I know of several people that almost never check the coolant or oil... This is how my friend ends up working on peoples cars... Low on coolant but had no idea... Poof there goes the head gasket/* ..... If they would have simply looked to see the system was full it wouldn't have been a problem...

The last 3100 he worked on was a 97 with 180,000 miles on it... It had dex all of its life... The intake gaskets finally failed, the lady ran it hot and killed the head gaskets... 180,000 and I have seen soo many reports of people blaming dexcool for their problems...

Sad part is that I have seen the Green coolant in a 3100 with the exact same results... Some before 100,000 some after 150,000 miles...

I'm just really pissy about the whole green vs dex cool thing I guess...
JR..I was helping Mechanic Dan change motors for a quite a while and this one truck we did... guy changed radiator, hoses, tstat...and the list goes on...motor blew..we changed it..he wanted to save money and asked us to use the old water pump along w/other stuff.... we finish up and are adding the fluids...somethings leaking bad. Both look at each other with the "What didn't you hook up and check twice" look. Coolant was pouring out the weep hole...

Moral of the story..moron blew a motor cause he didn't keep the rad full. Also couldn't diag a leaking waterpump....
LMAO... My friends brother in law had an Acura Legend with a 3.2 ... He ran it hot and killed the head gaskets... we tore it apart and replaced the head gaskets, put it all back together... Told him he needed a new water pump, he waited... Ran it hot again and poof there went the head gaskets again... New head gaskets and a few helicoils later it was running again with a new water pump... The the radiator sprung a leak, there went the head gaskets.... He ended up getting a low milage motor... You can only fix them so many times...

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