How to refill with coolant?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Rockhound, Aug 19, 2018.

  1. Rockhound

    Rockhound Junior Member

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    2008 Prius- We got a P1121 and P1116 Coolant flow Valve Position Sensor.

    We replaced the coolant flow valve ( we had to drain the coolant from the Drain valve in the bottom driver side).

    Now we are trying to fill it up using the reservior near the firewall on top of the engine, but nothing is going in. We pour the coolant in but it wont go anywhere. NOTE: about 3/4 gallon came out into a CLEAN container so we can reuse it.
     
  2. JC91006

    JC91006 Senior Member

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    You have to fill the radiator, you'll see the radiator cap once you remove the black cover in the front of the engine
     
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  3. Patrick Wong

    Patrick Wong DIY Enthusiast

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    [QUOTE="Rockhound, post: 2769885, member: 146015”]
    Now we are trying to fill it up using the reservior near the firewall on top of the engine, but nothing is going in. We pour the coolant in but it wont go anywhere.[/QUOTE]
    The reservoir between the engine and inverter is for the inverter/transaxle.

    As JC said, you need to remove the black plastic cover for access to the radiator cap.
     
  4. TMR-JWAP

    TMR-JWAP Senior Member

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    ummmmmm...going to take a long time to fill up the engine coolant loop when you're adding coolant to the inverter reservoir........

    The reservoir at the firewall is for the inverter coolant loop.

    The reservoir at the radiator is for the engine coolant loop. The control valve is part of the engine coolant loop.

    Depending on the level now, you may want to remove some of that coolant you added to ensure there's room for thermal expansion in the inverter loop.
     
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  5. Rockhound

    Rockhound Junior Member

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    LOL - Yup you guys are right! I was trying to fill the wrong one! Been a LONG weekend working on various cars in the family.

    Thanks again guys!
     
  6. JC91006

    JC91006 Senior Member

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    You'll need to do it a few times, check the level every morning and fill until full
     
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