Posted: Sun Aug 11, 2013 8:05 pm Post subject: GM Coolant Question
So my father had his water pump replaced on his '06 Impala LT. I noticed the mechanic put in Peak Long Life Antifreeze/Coolant to replace the lost coolant from replacing the water pump. It was the 50/50 mix. I asked why as GM vehicles required Dex Cool. The answer I got was, "This will work with almost any car. You will be fine. We actually don't even have any more Dex Cool in stock at the moment." It was also pointed out that roughly a quarter of a gallon was used instead of a full gallon/full system.
My father apparently didn't seem to mind. If it was my car, I would have done an immediate coolant flush. Question is, is it alright to mix the two as it was only "a quarter of a gallon?" I've researched and found it's not exactly good to mix the two but it wouldn't cause any immediate issues. Should the coolant be flushed and replaced with proper coolant?
Not familiar with Peak, but look into it and check it's compatibility. My father in law thought he was doing me a favor by throwing in "compatible" coolant and I ended up getting a flush, thermostat and all new Dexcool within a month, because the mix gunked everything up.
When in Walmart, I see 2 different Prestone coolants. One says Dexcool, & the other says it will mix with any coolant. When I flushed my coolant, this is what I used, but according to the jug, it mixes with anything. At another parts store, I found a coolant which said "original green coolant" but I forget which brand. To answwer the OP, it was only a quart that was added. I wouldn't worry, unless it was the original coolant in which case, it's time for a flush. But if the coolant was recently changed, I wouldn't worry about it. GARY
Like transmission flushing, there are different views on this topic. At work, the heavy line mechanic whose only job was to rebuild, & replace engines took his brand new S10, drained the Dexcool, & replaced it with green coolant. When I asked him why, he replied "If you've seen what I've seen, you'd do it too". This is a guy who takes engines apart every day, so I trust him. But, when my gal's 06 Monte Carlo hit 85,000 miles, & 7 years old, I decided to flush the Dexcool, & replace it with green coolant. I was surprised the Dexcool came out looking clean, & pink. So it goes both ways, but I will still use green coolant for future flushes. GARY
it was mainly the crap gaskets used by GM and the combo of aluminum, iron & plastic parts. They all expand and contact at different rates and the OEM gaskets couldnt make up the difference when the parts warped slightly. This allows air into the system causing the coolant to fail.
Dex just reacts to the air differently than the green coolant. If your particular car is prone to gasket failure, they will fail no matter what coolant you use. If you maintain your car and periodically check the fluids, you would see the Dex changing and can immediately fix the problem. If you dont check things out and you have a gasket issue and dont know about it, you will have problems.
In other words, Dex gets blamed for bad gaskets and engineering.
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