No, the WP fails silently first. If it started having shadow codes, it is a time bomb at this point. It will fail soon, and leave you stranded on the side of the road. When you get the dashboard message, it is to inform you that the car is -currently- overheating and you have to stop immediately or risk major engine damage. Just have it fixed.
The quote is typical from a dealer. That work can be done for ~700/800 at an intependent shop.
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