A/C clunk?

Hey everyone,

Noticed a few things this afternoon.

1) Upon startup of the truck after it had been sitting for a few hours, it sounded like a clunk. No lights come on, engine temp is perfect throughout the ride home.

2) A/C sounds ok on low, but turned up any higher and there's a repeated thud sound, kind of like a heartbeat (sorry best I can describe lol.) Almost sounds as if there's something on a belt and it makes a sound every time that spot comes around or there's something loose.

3) The parking brake clunked when I engaged it when I got home. I'm no mechanic by any stretch so not sure if this is related.

I have a service appointment tomorrow, but anyone have any ideas what I could be looking at? Pretty annoying for a year and a half old truck good times.

 

1) when did the clunk happen, during turnover or after it started up?

2) What about with the air on but AC off?

3) Not sure what this is seems unrelated

 

The impeller on the fan motor is broken. Take it in to the dealer. Happened on my 17, until it completely broke off. Sounded like 2 squirrels fighting in my glovebox.