I have a 2015 Toyota Corolla le with an automatic transmission that I bought in Sept 2016. Currently my car has 99,477 miles on it and when I bought it, it had around 42k miles on it. I noticed that when I'm in idle in drive, ex. At a drive-thru, my car will sometimes vibrate a bit and make an odd, wet type sound? Sorry its hard to describe 
and the other day the air vents weren't blowing heat/ac, or air period. Now come today, the air is working but I don't want to rely on hoping they will work because I live in the midwest & winter is going to show its ugly face any second. Lol. Also I noticed when I listen to certain songs that have a lot of bass, the speaker on my passenger side door sounds crackly like someone blasted the speakers a lot in the past. Personally I like to enjoy my music, not blow up the speakers so its unfortunate that it sounds that way.. maybe its due to something else? Thanks in advance for all the helpful tips/advice you guys share on here.
It’s best to break up the different issues into separate threads so it has higher visibility and more answers.
Ash sometimes they shake you might try my video make your car run better with a little spray cleaner. And it's not that hard to take the door panels apart and put new speakers in watch my video how to remove an inner door panel Scotty
Thanks! Also I was told I should change my spark plugs in the near future.. not sure if that's an easy thing for me to fix? Just need a little tutorial and to know the right parts to change them out. 👍