2010 Prius, very loud hum from AC

So...on a video I recently took while diagnosing the "Cold start shudder", the beginning of the video catches a sound that I find unusual, having never driven a vehicle with an "electric compressor" AC.

The first 2-3 seconds of the video, after starting the vehicle but before the engine kicked in. I'd had the AC on the prior night, so that sound was evident. I quickly turned off the AC so we could hear the "shudder" when the engine started, so you only get a second or two of the AC noise.

Whatta ya think, guys? Is this a "normal" sound for the Prius AC? It's not the blower-motor so I would have to assume that it's the compressor itself? It goes away if I turn off the AC but leave the blower on.

 

130k(ish)

 

yep

EGR cooler was 100% clogged

 

I bought a 10 year old car from a dealer essentially sight-unseen based entirely on the CarFax (which looked good). It drove nicely & everything seemed normal. Wanted a Prius, live in the country so I have to drive into the city, plan on spending the night...and plan on buying the car I've come to look at, because it'll be gone 24 hours after I say "no" to the salesman.

Started giving me trouble about a month in, various symptoms...and the oil (when I changed it) was black as sludge (although not as thick, thankfully).

I have a feeling the CarFax was fudged because this car was NOT maintained well.

Hard lesson learned. C'est La Vie, I guess.

 

I've gone up to 5w20 so far (1st oil change). next one is coming up in a bit over a month.
Also, ran 2 cans of of BG 44k over the course of a month.
Next, BG EPR (before oil change) & MOA (during)...all of those at advice received in that thread.

I was losing about 1/2qt per fill-up (I put about 400 miles/week on this car) prior to oil change & 44k, I'm down to less than 1/4qt...maybe the next step(s) will mitigate it even more. That'll be in about 5 weeks.

I've been told that once it starts, there's no stopping it...so all you can do is mitigate it.

 

Well...the highspeed driving isn't going anywhere, I commute 40 miles each way...all highway miles over rolling hills...every night.

As to the oil changes...that's what has me curious, after seeing that oil come out the first time.
I WAS a Taxi Driver by trade before the Uber Crash (F3#king Uber!!!). So regular oil changes (3500 or 5000 miles, depending on the vehicle I had at the time) is ingrained enough that it's practically a religion.

Caravans seemed to prefer a 3500 mile interval, while I could get away with 7k on my Sprinter. Good thing, that thing took 11qts of oil to change.

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