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If you have a vehicle with the dex-cool junk I'd recommend changing it over to regular antifreeze. When I bought my truck in 2008 it had dex-cool but I changed it over it had already left red gunk in my reservoir and a little in the radiator and on the radiator cap. So I flushed it and replaced the cap and just rinsed the reservoir out. Checked it last winter for temp rating and noticed there was a bit of that red gunk that came loose from the reservoir on the bottom of the new radiator cap. This time I put a new reservoir and run off hose, new radiator cap, flushed it 3 times just to be safe then filled with new antifreeze/distilled water. These pics are what it looked like.
Looks like a regular recovery tank no big deal right?
Until you see inside of it and the entire bottom looks like this.
Looks like a regular recovery tank no big deal right?
Until you see inside of it and the entire bottom looks like this.