It’ll be fine for a while until you can get around to replacing it with proper coolant, but don’t think it’s okay to swap out windshield washer fluid for antifreeze. yes, you will need to flush your coolant.
Can I use vinegar for windshield washer fluid?
1. White vinegar. According to Autoblog, this all-natural substance won’t freeze in cold temperatures and is known for being an effective glass cleaner during the winter. Dilute one part distilled white vinegar to three parts water to ensure that the acidity won’t affect your car’s paint or mechanical components.