Will this pump work with my existing washer fluid hoses?

These connect at factory mounting points, so your OEM hoses and lines will work without modification. Just plug it in and verify both circuits spray properly before buttoning up.

What if only one circuit isn't spraying after install?

Check your hose routing first — sometimes a pinched or kinked line can block flow to the headlight nozzles. If both circuits were working before and now one isn't, test the pump itself by checking voltage at the motor connector when you hit the washer switch.

Do I need to drain the old fluid before swapping the pump?

You'll save yourself a mess if you empty the reservoir first. Depending on your fluid level, you can siphon it out or just let gravity do the work once you disconnect the hoses. Top off with fresh fluid after installation.