An example would be if the truck is operating with a HD extended life coolant and someone is topping off with a conventional (green) coolant. Other reasons to perform a cooling system flush could be mixing of coolant technologies. An overheated cooling system can breakdown the coolant causing it to turn acidic, which will result in cooling system component failures in a short period of time.
The contamination could be oil, fuel, particulates, or hard water salts leaving deposits on cooling system metals. Whenever there are signs of any contamination in the system. Looks awful.One of the most frequently ask questions to our Prestone® technical team is: when and how often should I flush the cooling system in my HD truck? What procedure should I use to perform a cooling system flush on a HD truck? When To Flush The Cooling System Now the coolant has a bunch of scale and silicate (fallen out of suspension) floating around. First service was done after six years at a shop with conventional 50/50 using a flush machine, second service was done two years ago at the local dealership with Toyota Red conventional coolant.block and radiator drain. He was also frugal with cooling system maintenance. My father is too cheap to let me change them. It has 63k original miles, and has the original belts, hoses, radiator cap, and t-stat. Note: This is for a 1992 Toyota Previa with a 12.2 qt capacity. Then I'll run another 5 gallons of water through the system, then drain the radiator, and dump in the six quarts of concentrate. I plan to run 5 gallons of tap water through the system, then dump in the additive, and drive for a few days. For the antifreeze, there is a $5.00 gas card offer (via rebate) with the purchase of two gallons, dropping the price to a little over $6.00/gal. I also bought two gallons of Prestone All Makes All Models concentrate for $8.88/gal. Today, I went ahead and popped into WallyWorld and bought a 1L bottle of the Super Radiator Cleaner for $4.97. I'm a lucky guy, my school shop has a RobinAir 75700 Coolant Exchange machine on loan right now, so I can use that. Well, I live in Sacramento, so freezing really isn't an issue. It is suppose to remove the scaling that builds up in the system over time. It is hard to use this time of year, because you can't shut the car off with it, or it will freeze. You have to drain and rinse out the system to get all the antifreeze out, or it won't do squat. They are the same thing, the superflush is a smaller bottle than the cleaner.
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