Car Problem Reports

Chevrolet Impala DexCool antifreeze forms sludge

Chevrolet Impala Problem
7 Reports
Me Too

Model Year Affected: 2003

Engines Affected: 3.4L V6, 3.8L V6

Average Mileage: 84,239 mi (45,000 mi - 147,000 mi)

  • Visitor, , 3.4L V6, 100,000 mi

    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.

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  • Visitor, , 3.8L V6

    Kept on flushing radiator with cleaner putting more coolant. So far hasn't appeared again. First replaced radiator.

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  • Visitor, , 3.8L V6, 77,000 mi

    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.

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  • pacrhat, , 3.4L V6, 45,000 mi

    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.

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  • BuickOwner777, , 3.4L V6, 147,000 mi

    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.

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  • classycarole, , 3.4L V6, 66,435 mi

    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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