Leaking coolant from reservoir + passing pressure tests

Discussion in 'Prius v Care, Maintenance and Troubleshooting' started by velodork, Apr 29, 2021.

  1. velodork

    velodork New Member

    Joined:
    Apr 29, 2021
    3
    0
    0
    Location:
    35242
    Vehicle:
    2012 Prius v wagon
    Model:
    Two
    I see a lot of similar problems/posts that seem to be dancing around the same unidentified "problem"... Heres a brief bulleted timeline:

    1. Cold start shudder, ID'd as headgasket issue
    2. Added blue devil because Im a broke/hopeful student (MISTAKE!)
      1. Fixed cold shakes for 1 year
      2. Heat stopped working
      3. Coolant started leaking through the reservoir
    3. Replaced reservoir AND cap
    4. Paid Toyota $2300 to replace the headgasket after it started shaking
      1. Coolant is still magically disappearing through the reservoir (there is white residue and pink liquid when I inspect). Still getting occasional overheating
    The only thing that makes sense to me is that the system is overpressurized, thus causing the coolant to seep through little pores in the plastic reservoir. I have also considered that the coolant itself is overheating and "boiling off" but My OBDII/App isnt indicating above normal coolant temps...

    Given that the heat isn't working worth a damn (blows ice cold air all day though), could there be a coolant clog somewhere in the system? Ive done a coolant system flush which didnt fix anything. I'd really love to try flushing the heater core with a garden hose but it doesnt seem as easy to access on the Prius v wagons...

    Thanks in advance for your help and sorry for the lengthy post! Im a good historian and Ill be happy to answer any other questions to try to make sense out of this problem that seems sort of common post head gasket leak stop use...
     
  2. Tim Jones

    Tim Jones Active Member

    Joined:
    Jul 17, 2018
    996
    373
    3
    Location:
    SE Texas
    Vehicle:
    2013 Prius v wagon
    Model:
    XLE AWD-e
    That's a drag.......haven't seen this problem....wonder if there could be air in the system but you would think toyota would have got that on the HG repair. I don't think that blue devil plugs the heater core...
     
    velodork likes this.
  3. rjparker

    rjparker Senior Member

    Joined:
    Jun 6, 2008
    3,217
    1,587
    2
    Location:
    Texas Hill Country
    Vehicle:
    2012 Prius v wagon
    Model:
    Three
    No more cold start rattles since the hg repair? Hopefully you use your obd2 scanner to observe engine temps while you are driving. Normal is around 195F spiking to 205f for short high load periods.

    I doubt the coolant is coming through the reservoir plastic "pores". If the engine is overheating occasionally the pressure cap may be releasing fluid. But the root cause of the overheating is the issue assuming the hg repair is holding up.

    How long ago did they do the hg? How many miles since then? Normal overheating issues include radiator fan (both should energize with ac), electric water pump (observe coolant flow from bottom tube in reservoir after it warms up) and the thermostat (also observe coolant flow). Of course the radiator itself could be clogged and it sounds like your heater core is clogged.

    I suspect you will get more input now that Tim and I have weighed in. No applause necessary. Its a free Priuschat community service from the South Texas boys.
     
    #3 rjparker, May 6, 2021
    Last edited: May 6, 2021
    velodork likes this.
  4. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    43,504
    31,162
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    velodork likes this.
  5. velodork

    velodork New Member

    Joined:
    Apr 29, 2021
    3
    0
    0
    Location:
    35242
    Vehicle:
    2012 Prius v wagon
    Model:
    Two
    Hey thanks for the reply! I appreciate the feedback. Its been about 5k miles since the HG job. It actually overheated on the way home. I took it back to Toyota the very next day and they gave it a once over and didnt seem concerned...

    I actually wound up using a concentrated headgasket flushing product from Irontite after seeing some success resolving similar situations (different cars). Fingers crossed but it seems to have worked! No overheating but well wait until some more hot weather. Ill give a long term check review as well
     
  6. velodork

    velodork New Member

    Joined:
    Apr 29, 2021
    3
    0
    0
    Location:
    35242
    Vehicle:
    2012 Prius v wagon
    Model:
    Two
  7. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    43,504
    31,162
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    If you can manage to get some of the blobs, you might test with your stuff and/or vinegar; see if it dissolves. Or it might be gone lol.
     
Loading...