Hello again,
Sorry for that picture, I apologize. Like I said, though, I have seen it before. Okay, so it is antifreeze that has been mixed with something or has just a plain bad odor, which will probably carry through to your heater and defroster if let unattended, and that is what you definitely do not want now that Fall and Winter are here. I would recommend doing a flush and fill on your vehicle's cooling system. Here is a link below explaining the procedure, if needed:
https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars
Please go through this guide and get back to us with how everything turns out. I hope that this helps.
Thanks,
Alex
2CarPros
Thursday, October 31st, 2019 AT 5:09 PM