![]() Question - noticed the Dexcool brown gunk in the overflow tank, and only at the top of the radiator valve. It appears to have new oil, tires, and is clean all around. If it was the coolant we would have seen it pop up on those. Just picked up a used 2004 Impala LS that looks great 64k miles. That to me says if gasket issues cropped up later it was the gaskets not the coolant. The LT1s never had much in the way of coolant leaks definitely not gasket ones and far as I know 96 was the first year for Dexcool and the LT1 that year used the same gaskets as earlier years. I think the "dexcool problems" are a combination of stupid people both owners and service folks putting in green, the stopleak tablets GM began using with the 150K mile coolant interval and some poor quality gaskets.Ī lot of the 96 Impala owners complained about it clogging the heater cores but being the last year for a real Impala a LOT of them were stored, the storage lets the stopleak precipitate out and clog things. That said I just buy the Yellow mix with anything since I for a few years in between had a 94 wagon and it was just easier to keep a couple gallons of mix with anything onhand than separate green and Dexcool. I've had a bunch of experiences, but there's plenty I have not first hand messed with.I never had any trouble with Dexcool in my car or my wife's 2003 3.4l Impala which had original coolant till LIM gaskets at 142K miles and that problem seemed to be a torque issue not a gasket degradation issue. I'm curious, outside of gasket failure, what has DEX done to cause thousands of dollars of damage? If there is something I missed in my knowledge of the topic, I'm all ears (well, I guess in this case eyes). Again, I've seen the same gasket failures at the same mileage on cars with the green stuff. I speculate DEX was more of a scape goat at that point. Both manufacturers had the same problems. Nylon + ANY Coolant = BAD idea.įrom what I understand GM struggled with the gasket failure issues, they went between a couple gasket manufacturers (Fel Pro and Mr Gasket) to make the nylon gaskets. The claims of destroying nylon gaskets, I have seen the SAME gasket failure in cars that NEVER ran DEX. Discover unparalleled freeze protection and exceptional anti-boil performance with the Zerex Valvoline Dex-Cool Antifreeze/Coolant, exceeding industry benchmarks for optimal engine care. One WELL maintained car is a single owner '94 Formula Firebird (ran DEX from the factory WITH the crappy formula, routine flushes, no problems, currently about 70,000 miles).ĥ. Here are some solutions to the Chevy Impala cooling fan continuously staying on even when the engine is off: 1. i have a 2003 chevy impala with a refurbished 6cyl jasper engine losing antifreeze about half gallon every 2 weeks had radiator hose read more. I know a LOT of cars running DEX (some poorly maintained), zero issues related to DEX. 2003 chevy impala: cool antifreeze problem.cars. Odds are there is not much difference in the chemical composition of DEX vs the current green stuff.Ĥ. All the ones I see in the stores now state they work with "any color anti-freeze". Not that EVERYTHING the manufacturer recommends is 100%, but they recommend it.ģ. I've done my reading on it to my satisfaction of what I need to know.Ģ. Here are the reasons I am willing to "chance" it:ġ. ![]() It has cost me easily over a thousand dollars thanks to that genius design.If you problems with Dex are in relation to nylon gaskets, then your problem is with the nylon gaskets. If you plan to flush it, that would be the time to switch to the green stuff if you are more comfortable with that over Dex (the green anti-freeze will not harm these engines either).ĭex is fine now? Why would you give this garbage another chance. Give the cooling system a proper flush, and I think you will be fine. So far, from what I hear, THAT is the fix. Fel-Pro makes an aluminum replacement gasket. I can tell you what IS the cause of LIM gaskets braking, they are nylon and the nylon cannot tolerate the high fluid temps. I've done enough lower intake gaskets on a couple of car that NEVER ran Dex (my 3100 powered Grand Am never had Dex in it and the gaskets went bad twice, roughly 80,000-100,000 miles). I got news for all those who feel Dex is to blame, it's NOT Dex. My 2003 Chevy Impala had lost all the dex cool antifreeze and was. Equip cars, trucks & SUVs with 2018 Chevrolet Impala Antifreeze / Coolant from AutoZone. People believe Dex is why the lower intake gaskets break apart. The 2003 Chevrolet Impala has 9 NHTSA complaints for the engine and engine cooling:cooling system at 53,630 miles average. Type: Organic Acid Technology (OAT) Pre-Mixed Or Concentrate: Concentrate. Recommend you buy the Prestone with Dex (I flushed my Monte and my wife's Impala, refilled with Prestone with Dex).Ĥ. Like any fluid in the car (even the good ol' green Anti-Freeze), the coolant should be flushed.ģ.
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