DexCool antifreeze forms sludge on Chevrolet Impala

Average mileage: 104,330 (45,000–224,878)
Engines affected: 3.4L V6, 3.8L V6
1 model year affected: 2003
8 people reported this problem
7 people shared problem details
2003 Chevrolet Impala- 3.4L V6100,000
Same sludge. I didn't know what it was so I flushed the system, replaced a couple hoses a refilled with new Dexcool. The sludge continued to reappear. I have flushed again. I didn't know this may be related to the Dexcool until reading this site. The car now has close to 130,000 miles. I replaced the thermostat which fixed an overheating problem, but the thermostat may have failed due to sludge build up. My heater core does not work properly and I'm about to replace that. I also went and purchased a new radiator being that if there's sludge everywhere else it probably ruined the radiator also. Is my engine ruined? Do I have recourse against GM? I don't know.
2003 Chevrolet Impala- 3.8L V6
Kept on flushing radiator with cleaner putting more coolant. So far hasn't appeared again. First replaced radiator.
2003 Chevrolet Impala- 3.8L V677,000
I took my car to the dealership where I've been buying my cars, and having them do maintainence and service work. They told me that the price they quoted me includes a flush, replace a radiator hose and the sepentine belt. It cost $760.00! They advised me to have a radiator flush soon, unfortunately, they did'nt tell me that sludge was building up and more problems would be forthcoming. The second time I took it in they quoted the repair at $500.00. I asked why this new leak they found was'nt seen during my first visit. The advisor told me it is brand new! I just found out that there's sludge in my radiator because I inspected it yesterday! Now, I'm in the process of finding a reputable auto mechanic in my area, which is tough. I'll update this as soon as the problem is fixed. Thank you.
DexCool antifreeze formed brown gel-like sludge, first observed at radiator cap. Supposed to last 100,000 miles. Lawsuit settled for cases where engine failed. Flushed system and replaced coolant. Keep air out of system by ensuring coolant reservoir always at proper level and check radiator periodically by removing cap.
2003 Chevrolet Impala- 3.8L V6224,878
Car started over heating unexpectedly and trying to see what's the problem
I just discovered white slime on the underside of my 2003 Buick Century radiator cap and radiator filler neck. I think this is uniquely a GM DexCool problem because I have never seen this slime in any of the many non GM cars I've owned in the past. I flushed the cooling system 6 months ago with equal parts DexCool and distilled water so i shouldnt be having any problem like this. I know GM has settled lawsuits in the past over there DexCool 100,000 mile recommendation causing peoples engines to fail but if theres still a problem with DexCool they need to change their formula.
I just took my car to Firestone because of no heat. They said the Dexcoolant in the radiator had turned to sludge. They refused to remove it and suggested I go to a dealer.
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