Inverter water pump not working? 210K miles

My 2010 Prius don't have that whine sound coming from the inverter and there is no turbulent in the inverter reservoir. I have not really felt vibration from the in/out let tubes yet. Its got 210K miles on it. I got it used 82k miles on it in 2014 from last owner who lives in South CA where there is hot weather. I doubt s/he changed the pump ever. Do you think the inverter water pump not working? I got a mobile mechanic to change my spark plugs and he think the pump is not pumping base on no whine sound, no turbulent, no vibration. However, there is no codes, no engine lights on at the moment though. He used some device to scan it but no codes were found. I live in San Francisco so temperature is usually cooler and I usually do short trips here and there around here. Maybe it has to hit certain temperature before the pump start working?

 

1. many short trips like Uber and Lyft.
2. I don't know what that device is and yellow and black like a TI calculator but I think the techstream will do the same
3. I feel both hoses have small vibration so I think its working. I did many searches on the inverter water pump but very few on gen 3 prius maybe its not a common problem so I now won't assume mine don't work. I may need to go to luscious garage to ask for advice
4. ya I just drove to san diego recently. Besides short trips around town, I do road trips sometimes.
5. nothing major I know of.