No Heat After Multiple Tries? Gen2 07

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Mryankovic, Dec 27, 2024 at 10:47 PM.

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  1. Mryankovic

    Mryankovic New Member

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    Hello I'm new here, have been driving this car since 2017. Recently replaced the coolant control valve with an aftermarket model and then had the Toyota dealer do a flush and coolant change on the engine coolant system. Everything was just fine for one day and then I lost heat. Since then I have replace the coolant control valve with an oem version and immediately after I added more fluid and left the cap off the radiator to bleed, jumped the CHRS, and let it idle on maintenance mode with the cap off and the bleed screw cracked open. Still nothing. No codes anymore though. Tomorrow I am planning on jacking up the passenger side and trying the process all over again. Not confident that will help. I'm wondering if something got lodged into the heater core after my first day of functioning Heat, but I hear that this is pretty rare on Gen 2s. What else should I do?
     
    #1 Mryankovic, Dec 27, 2024 at 10:47 PM
  2. JC91006

    JC91006 Senior Member

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    You should make sure your hoses are not crossed and connected correctly. It takes a while to properly bleed the coolant. Check a few hours after driving the car and make sure the radiator is full (don't do it when it's hot). You may have to fill the radiator a few times before the coolant level is full. Then check your heat and see if you have heat.
     
    #2 JC91006, Dec 28, 2024 at 2:24 AM
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  3. BiomedO1

    BiomedO1 Senior Member

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    Monitor your coolant temperature and check your coolant pump, radiator for cold spots, both upper and lower radiator hoses should get warm warm to hot if circulating properly. Has the thermostat been replaced and how many miles on it?
    If you haven't been changing coolant per OEM specifications, that flush may've knocked something loose and is blocking proper coolant circulation within your system.

    Good Luck.....
     
    #3 BiomedO1, Dec 28, 2024 at 9:43 AM
  4. pasadena_commut

    pasadena_commut Senior Member

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    Review these two videos and make sure you didn't skip any steps:




    I second the suggestion to check the hoses. It is possible to hook them up wrong and take part of the cooling loop out of action.
     
    #4 pasadena_commut, Dec 28, 2024 at 5:57 PM
  5. Mryankovic

    Mryankovic New Member

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    Thank you very much. I was wondering about something getting knocked loose as well. All hoses are warm/hot though. Is flushing the heater core if it is clogged a horrible endeavor. And the thermostat is fine as the hoses are warm and it will not overheat even on the highway. Thanks either way.
     
    #5 Mryankovic, Dec 28, 2024 at 7:03 PM
  6. Mryankovic

    Mryankovic New Member

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    I am 99% sure the hoses are correctly reinstalled although I forgot to take a picture before hand. The top hose is the shorter one and the slightly longer one is on the middle, and the large one obviously on the bottom? No white dots on mine as they got wiped away at some point. Thanks for the reply very much appreciated.
     
    #6 Mryankovic, Dec 28, 2024 at 7:07 PM
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