I do not think it will hurt anything.
Windshield washer fluid has a type of methanol, ethanol or ethylene glycol. Anti-freeze is made of ethylene glycol, ha ha, so you have added anti-freeze to your anti-freeze, just with some different additives.
Some radiators are picky about having a 50/50 mix of distilled water to anti-freeze, especially in aluminum radiators, as it is corrosive to an extent. However, you probably did not put in enough to change the ratio. If you added near a gallon, you could drain some fluid and add distilled water.
I would just wait until you flush and fill anti-freeze which you should do every 30,000 or so.
Monday, September 26th, 2011 AT 12:28 PM