Hi, I’ve had my car since April of this year. At first the ac didn’t rumble when I used it or heat but after like 2 months it started. It usually doesn’t start immediately until recently which I think was due to cold weather. Any idea what it could be?
Update: I haven’t fully figured it out yet. It fully works heat and cold so I’m gonna check blower if anything. Honestly forgot about the post but haven’t had the money until recently. So I’ll update once I go deeper into it

 

bump cause ima new owner and trying to educate myself

 

In what location of the car is the rumble present? Under the hood, dash board........?

 

I have a rumble but it’s due to the rpm’s at idle bouncing because (i think) the electrical load from the ac compressor being in use stresses the whole system out. I’m thinking of doing the “big 3” electrical power/ground wiring upgrade, and hoping it will eliminate or mitigate this annoying issue.

but if your rumble is from something else, maybe you have a small leak in the exhaust system somewhere? Just a random guess but please do update us if you ever identify and fix your issue.

 

it could be your ac blower, I just replaced min this week and its fairly inexpensive ill drop a few links but hopefully you've already resolved this issue

https://www.rockauto.com/en/catalog/...wer+motor,6916

 

Could be your condenser fan assembly, since you say it only rumbles when the ac is on. I assume it’s fine with the fan running but the ac button is off?