2009 Touring, hi temp warn, wet psngr floor

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Landon51, Mar 19, 2021.

  1. Landon51

    Landon51 Member

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    Hey all,

    I'm back with a 2009 Touring edition worth 240k miles.

    We were getting no heat, but i was getting over temp warnings, it works slow down and the over temp would go away.

    I would add water to the over flow but didn't know to add water to radiator until recently. I was able to get 34 oz of water into it. We started getting heat, and the next morning. all the water was on the passenger floor.

    The radiator water was clear - no hint of red at all. The guy i got it from didn't mention any heater problem.

    I've noted a little unexpected water behind the AC condenser.

    Oh, nothing had shown up in the oil. No mayo or anything.

    1. On a wet day it will start rough. On a dry day it only starts rough when it is warm. Possibilities?


    2. I'm assuming that the heater core may be shot. I'm hoping that it's just a loose hose. If the core is broken, is there a common piece that breaks? Could it be possibly repaired in place?

    3. What could happen from having all drinking water in the radiator?

    4. I have codes for misfires on 1 and 2 cylinders. I have not checked the sparks or coils. I have not run injector cleaner or anything else through the system.

    5. Over a thousand miles and no oil loss; however, the oil line is about 3/4th inch above the full mark.

    Jerome

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    #1 Landon51, Mar 19, 2021
  2. bisco

    bisco cookie crumbler

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    that's too high, who did it? drain some out

    no problem with drinking watertemporarily, but you don't want it to freeze, overheat, or corrode
     
    #2 bisco, Mar 19, 2021
  3. mr_guy_mann

    mr_guy_mann Senior Member

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    Top of the list for misfire causes is ignition problems, plugs an coils. However if there is a long term cooling system leak, then head gasket damage due to low coolant/ overheat is possible.

    If there is coolant leaking into the passenger compartment then the core itself likely has to be replaced. The heater hoses connect on the engine side of the firewall, so a leak there would not (usually) get inside.

    Replacing the core involves removing the dashboard and the A/C heater housing (and that requires removing the A/C refrigerant then evacuating and recharging afterwards)

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    #3 mr_guy_mann, Mar 21, 2021
    Last edited: Mar 21, 2021
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  4. Landon51

    Landon51 Member

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    #4 Landon51, Mar 21, 2021
  5. Landon51

    Landon51 Member

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    sorry for quotting myself. is it possible to simply bypass the heater core understanding that my car will have no heat.
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    #5 Landon51, Mar 21, 2021
  6. TMR-JWAP

    TMR-JWAP Senior Member

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    Yes, and it's not very difficult at all.
    Remove the windshield wipers, the cowl trim, the wiper mechanism linkages and the cowl tray underneath them. This gives a clear view of the top of the engine and the two coolant hoses behind the engine that connect to the HVAC fittings at the firewall. Merely unclamp the hoses, pop them off the firewall fittings, add a double male splice fitting between them and re-clamp. Fill and vent as required to remove any air pockets..
     
    #6 TMR-JWAP, Mar 21, 2021
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  7. Landon51

    Landon51 Member

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    Would this be solid or pass thru?
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    #7 Landon51, Mar 22, 2021
  8. TMR-JWAP

    TMR-JWAP Senior Member

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    I would do pass through, as it would simulate coolant flowing through the heat exchanger
     
    #8 TMR-JWAP, Mar 22, 2021
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  9. Landon51

    Landon51 Member

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    engine pass thru seems to have worked. I'm still losing water - can't call it coolant anymore. 8)

    There's no heat in the car, but that was expected. There's also no water on the floor.

    I still have the warm start shake so I'm worried that I'll have to either install a new engine or replace the head gasket.

    Which one is the easiest?

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    #9 Landon51, Apr 4, 2021
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