drain all coolant then flush. refill with anti-freeze
should be the same reservoir as the front windshield wipers
May be this info can help you: http://www.at-hidraulic.eu/faq/ This is the article from specialized hydraulic center about power steering
Do not drive it until the fluid is changed.
You need to have the brake fluid changed immediately. Washer fluid will damage all of the seals in the brake system
Windshield wash should not be put into a radiator.
Open the cap on the reservoir and pour it in.
Container, right front side of engine compartment, yellow oblong cap with a windshield washer drawing on it.
in the washer bottle
What happens when you put windshield washer in the coolant in a Grand prix Pontiac
It is in the bottom of the plastic tank that you put the washer fluid in. Remove tank and look at the bottom of it and you will see how it comes out.
The owners manual shows that the washer fluid for the liftgate is supplied by the reservoir for the windshield
Do not drive the car. Have it towed to a repair shop and have the brake fluid changed.