I can't really see if it's already there or not because of the shadow and such..... but that should be where the air bleeder valve is for the coolant system...
As far as the coolant reservoir, I don't know of any that are clear.....
that's a bleeder & our car doesnt have a reservoir tank.......its just an overflow tank if coolant/antifreeze is needed just open the t-stat cap (WHEN CAR IS COOL TO TOUCH) and add whatever amount is needed
The tank in the back IS acting as both a reservoir tank (as it acts as a reserve deposit for the coolant) and an overflow all in one so... everyone just calls it an overflow tank. Custom might be the way to go I guess.
Its a bleeder for the coolant system. When you get an air pockey or something, run the car, open that bleeder, and the air escapes, just like your brakes, so you dont have an air pocket in there and overheat at random.
I use it everytime i flush my coolant. Completely fine with nothing on it, thats how it is supposed to be!
10mm, or 8mm wrench and loosen it like a nut, and the coolant will come out the little hole. If you have an air pocket it would spit and sputter, and you keep it open until the collant has a steady flow, then close it and forget about it until you need to open it again!
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