That is the
windshield washer fluid reservoir. On your 1998 Ford ZX2, the windshield washer fluid reservoir is located on the passenger side of the engine compartment, near the radiator cap. To fill the reservoir, simply open the cap and pour in windshield washer fluid until the reservoir is full. Be careful not to overfill the reservoir, as this can cause the fluid to leak out.
Here are the steps on how to fill up the windshield washer fluid in your 1998 Ford ZX2:
1. Locate the windshield washer fluid reservoir.
2. Open the reservoir cap.
3. Pour windshield washer fluid into the reservoir until it is full.
4. Close the reservoir cap.
That's it! You have now successfully filled up the windshield washer fluid in your 1998 Ford ZX2.