![]() ![]() If you decide to switch coolant types, make sure to use a strong coolant system cleaner (such as one of the powdered ones using oxalic acid) to de-gunk your system and then thoroughly (I mean stick a garden hose in there and let 'er rip-I know, it's not distilled water, but not a big problem if you drain most of it out) flush it out before adding your new coolant.I have a 93 Buick PA Supercharged 3800. Personally, I continue to use the "green" coolant in my GM vehicles (1988, 1979) without any problems. You will find plenty of interesting reading material (these keywords will lead you to more technical information on the coolant, as opposed to the plethora of rants about failures if you were to search using "dexcool"). Here's an interesting article from a seal material manufacturer's web site regarding the critical nature of the seal materials used with OAT coolant:ĭo a google search as follows: "organic acid technology" coolant There may definitely be a problem with the chemical makeup of certain Dexcool formulations, which use Organic Acid Technology (OAT). I also suspect that if air gets into the cooling system (coolant level drops due to a leak), this may contribute to gunking issues, but I cannot back this up with fact. What I find interesting is that some people have gone well over 100K miles with their GM vehicle with the factory-filled Dexcool without any problems, while others have had simply horrible cooling system failures very early in the vehicle's life.įrom what I have read, one thing which can "poision" a dexcool-filled system is if anybody (such as some ignorant teenager at a Quik-lube) tops off the system using standard "green" coolant. The e-mail address for our litigation team is is a lot of discussion on the internet regarding this topic (do a search, see below). Due to the enormous number of vehicles affected, it is impossible for us to respond to individual inquires, and we do not maintain a list of affected owners. It is not necessary that you contact us at this time. There is no need to contact us at this time, but please visit our website periodically for updates on important developments, bearing in mind that we do not expect any major developments until near the end of 2005. If the litigation is successful, all class members will be notified and provided with the paperwork necessary to file a claim. If you are the owner of one of these vehicles, you are a potential class member. The pending class actions seek relief on behalf of all owners of GM vehicles that came from the factory with Dex-Cool. ![]() ![]() That was the year General Motors made the decision to begin using Dex-Cool as the antifreeze/coolant in these vehicles. The law firm of Cory Watson Crowder and DeGaris, P.C., along with a group of other prominent law firms has filed several class action suits against General Motors alleging defective engine coolant systems in most General Motors vehicles, light trucks and SUVs sold since 1996. Any other ideas? Anyone know if the coolant level sensing system Buick uses is prone to problems? Also, the oily mess that has collected in the coolant system baffles me. Or I think perhaps I should replace the coolant level sensor. What gives? My main concern is that I may have a head gasket leak causing oil to get into the coolant, or worse, something cracked. To eliminate the possibllity of low coolant, I plan on really overfilling the system and seeing if the light is still intermittent. The "Low Coolant" keeps coming on erratically even after I did this. I removed the low coolant sensor from the radiator and cleaned a slight amount of goo from the sensing prong and re-installed it. Also, if I remove the radiator cap, coolant pours out because the radiator is completely full. In addition, the "Low Coolant" indicator light recently started illuminating intermittently and the coolant level appears it is is well above the "Min" mark on the plastic coolant reservoir and it appears there are no leaks. Now I notice that the radiator filler neck keeps collecting this copious oily mess that looks like thick engine oil, but the oil level is not dropping one bit, nor is there any coolant in the engine oil. I flushed and replaced the coolant with the specified orange Dexcool last year. I figured the rental car company put some type of additive in the coolant that was not compatible with GM coolant. Before I met her she bought the car from a rental car company with 13,000 miles on it and she never had the cooling system serviced. Last year I noticed my wife's 2001 Buick Century had a gooey sludge in the coolant. I figure with all the wisdom on this list, I'll ask a non-VW question. ![]()
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