Green cap on engine?

[Turboboy]

What is the green slotted cap left of the battery and below the air filter?
Thanks.

[v-dubed]

coolent resavoir

[speedie]

That is the power steering fluid reservoir...coolant tank is on the passenger side of engine with a blue top:band:

[v-dubed]

opps nm lol... i was thinking about the honda :(

[Turboboy]

Thanks.