New knocking sound when engine is off and car is sitting

I have a 07 Prius that just had its hybrid battery fixed and codes cleared. I drove the car to test out everything and now I’m getting some sort of knocking sound when the engine is off. Has anyone heard this before? I’ve never had this noise in my many years of ownership.

 

Possibly? I hear a noise other than the electrical whine of the hybrid system but I’m not sure that’s related.

 

I had a theory it was the 3 way switching valve because the noise sounded like an actuator. I ran the heat for a minute and then shut it off and now the clicking/knocking is gone. So a win I guess? Noise hasn’t come back after a couple