The Auto Club advises you to have your coolant system thoroughly inspected. To get ready for the hot summer and fall, I recently had the radiator flushed and was amazed at the amount of sediment that came out. Apparently there is a lot of minerals in the water in my area. No water, no sediment. In this case, more is not better.
Coolant is formulated to work most effectively when mixed with water.
At normal ambient pressure, coolant has a higher boiling point than water. However, that changes when the coolant is under pressure in the car's cooling system. When I run the air conditioner in my Nissan Stanza, the carpet on the passenger side gets wet. This has never happened before. Apparently, water condensation from the air conditioner is leaking into your car.