Hello, Friends!

I've owned my truck for about two years, and this is starting to bug me:

When I start the truck, or shut it down, there's this 'click' in the passenger-side of the dash that lasts about 10 seconds, about two 'clicks' per second at a regular cadence (so it isn't a heater blower shutting down). Lasts about 10-15 'clicks', then goes away.

Everything seems to work fine. Never had a problem with the heater or A/C, controls seem to work OK. Only once, last Summer, the A/C vents all shut. But I turned the A/C completely off, waited a bit, then turned it back on and all was fine. Only time it happened.

Anyone on the List have any thoughts about this?

Thanks for your help. I'd love to figure this out!