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Heater blowing cold

Discussion in 'Gen 3 Prius Technical Discussion' started by timnthomas85, Feb 24, 2022.

  1. ASRDogman

    ASRDogman Senior Member

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    Did you flush out the radiator?

    How fast did you add coolant? You need to fill it very slowly, and with little amounts.
    Takes longer, but no trapped air.


     
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  2. Brian1954

    Brian1954 Senior Member

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    Replacing the rotor/impeller would be my plan "A". Pull out your existing water pump and check how hard it is to rotate the impeller. If there is resistance to it being rotated, pull out the impeller and look at the white plastic that covers the magnet end. Do you see splits or swelling in the white plastic. If so, I would try just replacing the impeller. If not, I would replace the complete water pump (plan "B").
     
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  3. Bobbi81

    Bobbi81 New Member

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    Hi again, Thanks for your advice. I ordered the rotor, but the original one was seized and didn't come out from the shaft; I replaced the whole water pump, and the problem was solved!!
     
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  4. ASRDogman

    ASRDogman Senior Member

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    Did you remove the little "O" ring on the shaft to remove the empeller?
    At least you found the issue!.

     
  5. Bobbi81

    Bobbi81 New Member

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    Yes, I did. But the rotor was just locked!
     
  6. Brian1954

    Brian1954 Senior Member

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    That does not surprise me since the previous owner put stop leak in the coolant.
     
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  7. Bobbi81

    Bobbi81 New Member

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    Now there is a small issue, my engine temperature won't go more than 136 f or 55 c usually in the city. I use to drive 5-6 hours a day and heater is really hot in med fan, and still a bit hot on high but normal temperature in normal mode is that.
     
  8. Bobbi81

    Bobbi81 New Member

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    NewNow there is a small issue, my engine temperature won't go more than 136 f or 55 c usually in the city. I use to drive 5-6 hours a day and heater is really hot in med fan, and still a bit hot on high but normal temperature in normal mode is that.
     
  9. ASRDogman

    ASRDogman Senior Member

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    It had the fake stop leak. It clogs everything except the leak.
    So your radiator, heater core, thermostad, coolant pump, and every little
    passage for the head and more are clogged.
    Using white vinegar and water mix might clean it out.....

    Everyone that has gone through this has had a nightmare of a problem trying
    to get it all cleared out.