I had the same problem with the Firebird. Turns out that the blinker fluid came undefilled from the factory. There's a TSB out for it, and they'll top it off for free. My dealer told me that there's no such thing, but don't just walk away and keep insisting that they fill your blinker fluid for free. They did and I haven't had a problem since.

 

There's your answer.

Hope you enjoyed alienating yourself and not finding out your answer.

Have a nice day!!!