Yeah, but the sight glass is a very important feature.
Dexcool does contain stuff that, over time, eats pretty much any polymer this side of HDPE or Teflon; including a solvent used in the production of polycarbonate, as well as stuff that's not the brightest thing in the world to pump through aluminum. You can try to stop those reactions with other ingredients all you want, but it's still going to happen, and it's going to hit the weakest links first.
That mess needs to be changed more frequently than they indicated, if you want to prevent it from reacting with pretty much everything in the system.
Acrylic is outstanding stuff, but it's not fit for an engine bay. Polycarbonate... That depends on several factors. There's a reason manufacturers use HDPE to make this stuff, even if it's not the most transparent material in the world. It's an idiot-proof way to get a reservoir that'll hold pretty much anything you like within a very broad temperature range.
They'd probably be better off with a translucent window made of HDPE or tempered glass. Glass can take a beating, and is far less likely to react with coolant than polycarbonate.
Is that thing internally baffled at all?
Cheers,
Kennith
