Heater not working

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by Willl, Jan 23, 2021.

  1. Peter123

    Peter123 Active Member

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    A few, but not many, of the gen 3 head gasket failures were caused by water pump failures and not EGR. Do you think that might be a factor here?
     
  2. Willl

    Willl Junior Member

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    Mine is most definitely a head gasket failure. Now that I filled the coolant it is blowing white smoke out the exhaust everywhere.... So now I understand why the coolant was left completely drained before, so it would not show any visible signs or misfire.

    Does anyone know if all gen4 use the same engine?

    Can I just swap any 2016+ engine for my 2019 engine?

    And do I need to find a hybrid specific mechanic to do an engine swap on a Prius? Or should any competent auto mechanic be able to do the swap correctly?
     
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  3. dacoobob

    dacoobob New Member

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    Chalk up another one. My 2016 Prius Four Touring with 106k miles is at the dealer service dept now, they tell me it's a blown head gasket. I brought it in due to the temperature light coming on during freeway driving, they saw that the coolant was low and scoped the combustion chambers, and found evidence of coolant in the cylinders (carbon washed off the piston heads, especially in the #1 cylinder).

    The dealership wants to replace the engine and quoted me a totally ridiculous number ($8k). I'll be taking it to an independent shop that specializes in Toyotas for a second opinion. Despite the dealership's claim of coolant in the cylinders, I've had no knocking or shaking on startup and no white smoke or excessive steam out the tailpipe, so I am assuming the leak is not huge yet-- if it is in fact the HG. Hopefully the other shop can replace the HG and machine the head for under $2500, but we shall see.
     
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  4. Mendel Leisk

    Mendel Leisk Sand Pounder

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    New engine, or salvage?
     
  5. dacoobob

    dacoobob New Member

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    Salvaged engine with 47k miles on it. After calling around, most non-dealer shops refuse to work on hybrids (no surprise), but the couple that will do it want $4k+ to replace the HG, or $6k+ to replace the engine. I thought I was being safe by getting a Gen4 instead of Gen3... d'oh.
     
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  6. dacoobob

    dacoobob New Member

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    UPDATE: turns out mine was not a head gasket failure after all, but rather a coolant leak at the exhaust heat recovery heat exchanger just aft of the lower catalytic converter. so coolant was getting into the exhaust and showing up as white "smoke" (steam) while driving, just not thru the head gasket. glad I got a second opinion before just replacing the motor like the dealership wanted to do! replacing the exhaust heat exchanger will still be expensive (~$2k, 1300 of which is parts), but a lot cheaper than a motor replacement or head gasket repair.

    i found a Toyota TSB about this issue: T-SB-0135-19. unfortunately my Prius is outside the warranty period for this one, so no free fix.

    the parts are 2 months out, so the shop suggested disconnecting the coolant hoses from the leaking heat exchanger and connecting them together with an elbow, bypassing it the leaking part. that would at least drive it for the next couple of months until the replacement part comes in. the motor won't warm up as quickly (so mileage will suffer a bit) but that should be fine temporarily, right?
     
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  7. Elt31987

    Elt31987 Active Member

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  8. Elt31987

    Elt31987 Active Member

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    They are charging too much it would seem. The TSB mentions 1.5 hours of labor. So about what i paid. 228 in labor. Below are the prices of the parts if i ordered my parts on the dealer site instead of having the dealer order them themselves
     

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  9. ChapmanF

    ChapmanF Senior Member

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    So was the dealer just blowing smoke about what they saw in the combustion chambers? What did the second-opinion folks say about that?
     
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  10. dacoobob

    dacoobob New Member

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    They didn't mention it, and unfortunately I forgot to ask. However I've been driving the vehicle with the exhaust heat exchanger bypassed for the last week and haven't been losing any coolant as far as I can tell, so I'm hopeful the dealership guys were just full of shit. Definitely something to keep an eye on though, especially since the engine did overheat a few times before I took it in.

    I should probably get a cheap borescope and check the piston heads out myself.
     
  11. RRxing

    RRxing Senior Member

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  12. Elt31987

    Elt31987 Active Member

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    Any update? Did you bring up the cost and inquire why its so much more?
     
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