Liquid sloshing sound when Turning Car off/on

1. Any warning lights on?
2. Does the cabin heater work OK?
3. Do you hear any air bubbling in the heater core?
4. How is the fluid level in the radiator (must remove radiator cap to look inside, do not rely upon the fluid level in the overflow reservoir)

If your answers are no, yes, no, and full; then don't worry about the sound of the engine coolant heat recovery system pump.

 

it could be your gas tank, is it in back?

 

patrick probably nailed it then.

 

Therefore, your car has air in the heater core. You can deal with that issue yourself.

1. Make the Prius READY
2. Turn the heater temp control to MAX HEAT and turn the vent fan to maximum speed.
3. While the car is in P and stationary, rev up the engine as fast as it will go, which is only ~3K RPM or so. Keep revving the engine for 10 minutes - or until you no longer hear air bubbling in the heater core.
4. Make the Prius IG-OFF and let the engine cool down.
5. Check the radiator fluid level in the radiator itself as well as the overflow tank after the engine is cold; replenish as necessary with the correct Toyota Super Long Life Coolant.
6. Drive the car and make sure you no longer hear air in the heater core - if you do then repeat 1-5 above.

 

You can try revving the engine while in N.

The reason I suggest doing this while the car is sitting there on your driveway is so that the engine is not stressed by being under load while air remains in the system.

Actually driving the car would achieve the same effect if you are driving at a sufficiently high speed - 70 or 75 mph for example - to get the engine RPM up at a sustained high level. However if substantial air remains in the engine coolant system then you run some risk of engine damage. When the engine is under load moving the car, it is generating much more heat energy.

 

in neutral? in park, it charges the battery, and may be unwilling to put more charge in.

 

I do not know. I am able to do that with my 2004 and 2007.

Perhaps you need to put the engine into inspection mode.

Can't get inspection mode | PriusChat

 

All these Prii models have changed so much and are all so different that it is difficult to say what is normal anymore.Without running out to my garage and checking, I believe tht my PIP and my C model will not allow me to run the engine in neutral. However, both will allow me to run the engine in drive, parked in my driveway. all brakes on. This is a good procedure for flushing debris out of engine or for force charging the HV battery.. Can also be used in inspecting and checking the coolant and heater systems. Air in any coolant system happens easy if the system is opened anywhere and not properly bled. Hopefully all this rambling has aided a bit.

 

PS. Patricks suggestion of inspection mode is probably safer. I found it necessary to bleed all petcocks which included one under and to the rear of the engine block.

 

Only the 12V will charge. The HV only charges in drive. Altho, if I coast in neutral for a mile or so with my C, after returning to drive it will reward me with 2-3 Mpg more. That is a nice improvement and one that Toyota keeps quiet about. Maybe I missed it in the owners manual ?

 

i thought when you went to the car wash, if you put it in neutral, it told you to put it in park so the battery will charge. is that the 12v? ah, my mistake.

 

Cant say, I wash my car myself.

 

me neither, i never wash my car.