I got the same letter for my '03 Silverado. It's not a recall, but a "special policy," which means if you have the problem described in the letter before 150k miles, they will repair it under warranty. The problem is with the blower resistor and connector corroding and/or melting. Keep the letter in case you ever have a problem with the blower.
Good Luck and God Bless
Good Luck and God Bless
