that is windshield washer right guys it seems blue 93sentra dont wanna mix anything the previous owner got hungry and ate the cap..

There's 2 over there. One's the radiator overflow, and the other is the windwhield washer reservior.

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Matt
92 SE-R from Heck

The one that all you can see is a neck going down into the fender thats the windshield cleaner. The one that you can see the whole bottle and has a tube from the bottom to the radiator is your coolent