Inverter cooling water pump replaced - but have a humming sound

Did you bleed the system? Maybe that’s what you’re hearing


iPhone ? Pro

 

A working pump does make a slight noise. If the fan and engine are off you can easily hear it in the car if parked in quiet place. If fan is in slowest speed I can still just hear it. But any more noise than that and I can't.

If your pump is noisier than that try to bleed the system. If there is no air in system and it's still too loud then it might be a bad pump.

 

Is it low on coolant?

 

Proper coolant?

 

It’s because you bought a cheap aftermarket pump. Hopefully it lasts more than a month and a half like 2 posters here recently had happen.

 

Don't be concerned about the sound check out if its circulating properly. Open the reservoir and look inside with a flashlight the fluid should look like its boiling which is strong circulation. if its just sitting there or barely moving the pump is bad and or has air in it.
Aftermarket pumps suck.

Very very easy to bleed.

 

Are you sure all the bolts holding it are tight? Especially if you replaced the base plate with it. If those two bolts are not fully tightened down it might vibrate in resonance with the normal pump frequencies which would make it a bit louder. A working pump can be felt to vibrate with a finger, and I can hear it if standing over it with the hood up, but if anything else is going (like even the ventilation fan in the car) then I can't hear it. On the other hand my hearing sucks, so others probably hear the pump when I wouldn't.