Heater flap? Actually my 93 Chevy has been doing that for about 2 years. I can plug the flap for a short time. Then it sounds like a ticking clock sort of in glove box.-lol. Goes away after about 15 seconds? My guess-sounds like the same issue I have. Nothing to worry about. Easy fix if it really bothers you.
I’m happy to assist further over the phone at https://www.6ya.com/expert/shannon_b38635e8878032de
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