Or it may have been a click click click. Either way you could have set a metronome to it, and it sounded trouble.
Timing is everything.
So I did what every red blooded American male without any mechanical training whatsoever would do in this instance . Ignore it . FOX's World's Most Dangerous Police Chases can do to distract you from the nagging realization that you may soon be without heat. Not a comforting thought. However, I was spared further discomfort that night when I fell asleep.