1. Attachments are working again! Check out this thread for more details and to report any other bugs.

cooling system one fan not working and antifreeze bubbling out of overflow tank.

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by creatorcake, Feb 19, 2019.

  1. creatorcake

    creatorcake Junior Member

    Joined:
    Jul 6, 2015
    37
    16
    0
    Location:
    41.1952133,-73.288405
    Vehicle:
    2012 Prius
    Model:
    Three
    i replaced water pump and now one fan not working on drivers side 2014 prius. car runs fine no codea just gets to hot under load. thermostat is good. fuse keeps blowing on 30 amp fuse in the 30 30 50 fuse under hood fuse box.
     
    #1 creatorcake, Feb 19, 2019
  2. creatorcake

    creatorcake Junior Member

    Joined:
    Jul 6, 2015
    37
    16
    0
    Location:
    41.1952133,-73.288405
    Vehicle:
    2012 Prius
    Model:
    Three
    i replaced water pump and now one fan not working on drivers side 2014 prius. car runs fine no codea just gets to hot under load. thermostat is good. fuse keeps blowing on 30 amp fuse in the 30 30 50 fuse under hood fuse box.
     
    #2 creatorcake, Feb 19, 2019
  3. Pluggo

    Pluggo Senior Member

    Joined:
    May 23, 2016
    608
    532
    0
    Location:
    Folsom, Pennsylvania
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Advanced
    Find out how to purge air out of the system. The car depends on liquid coolant, air won't do the job for you.
     
    #3 Pluggo, Feb 19, 2019
  4. ASRDogman

    ASRDogman Senior Member

    Joined:
    May 29, 2018
    5,898
    3,162
    0
    Location:
    Florida
    Vehicle:
    2010 Prius
    Model:
    Two
    You must get ALL the air out.
    And if one fan is not working, and it's blowing the fuse, then it's probably bad.
    It should spin easily by hand. Make sure the engine is OFF, then spin both fans.
    they should be equal.
     
    #4 ASRDogman, Feb 19, 2019
  5. creatorcake

    creatorcake Junior Member

    Joined:
    Jul 6, 2015
    37
    16
    0
    Location:
    41.1952133,-73.288405
    Vehicle:
    2012 Prius
    Model:
    Three
    system is deffinetly purged of air. when i run car in matenaince mode it heats up to aroun 200 f then when thermostat is open it catches back up, i can take cap off and let run for a long time and there is no bubbling and coolant flows fine. but then when on highway under ;oad it will reach 204 before catching up this is when anyifreeze comes out not alot but enough to smell it. i can drive car for hours and it only happens ocasionally when under load. and have changed cap on resovior. the fuse on the 30 30 50 fuse under hood box blows. any ideas
    i wish it was air but thats not it
     
    #5 creatorcake, Feb 19, 2019
  6. ASRDogman

    ASRDogman Senior Member

    Joined:
    May 29, 2018
    5,898
    3,162
    0
    Location:
    Florida
    Vehicle:
    2010 Prius
    Model:
    Two
    If you can spell coolant, then you have a leak, somewhere.
    You need to do a pressure test and look for a leak.
     
    #6 ASRDogman, Feb 19, 2019
  7. creatorcake

    creatorcake Junior Member

    Joined:
    Jul 6, 2015
    37
    16
    0
    Location:
    41.1952133,-73.288405
    Vehicle:
    2012 Prius
    Model:
    Three
    it coming out of cap no leak pressure test done cap replaced.
     
    #7 creatorcake, Feb 19, 2019
  8. Raytheeagle

    Raytheeagle Senior Member

    Joined:
    Jul 1, 2016
    11,251
    15,476
    0
    Location:
    Bay Area, California
    Vehicle:
    2019 Prius Prime
    Model:
    Prime Plus
    Why did you replace the water pump?

    Did you have a blown head gasket?

    Did you try to use head sealer and potentially clog the radiator?

    All connections are tight and no loose wires or rodent damage?

    Any recent damage to the car or other work done?
     
    #8 Raytheeagle, Feb 19, 2019
  9. creatorcake

    creatorcake Junior Member

    Joined:
    Jul 6, 2015
    37
    16
    0
    Location:
    41.1952133,-73.288405
    Vehicle:
    2012 Prius
    Model:
    Three
    are cooling fans supposed to be on when ac is on. no bad fittings no leaks. waterr pump died no head gasket leak tested with head test kit
    all is good except for the drivers sde fan does not come on and blows fuse.fan seerms to spin freely. it also starts for a few seconds when other fan shuts down after cooling radiator.
     
    #9 creatorcake, Feb 19, 2019
  10. ASRDogman

    ASRDogman Senior Member

    Joined:
    May 29, 2018
    5,898
    3,162
    0
    Location:
    Florida
    Vehicle:
    2010 Prius
    Model:
    Two
    ???You say all is good? But you have a coolant leak?
    Recheck the wiring. If the fan was working before replacing the pump, maybe you pinched a wire to the fan?
     
    #10 ASRDogman, Feb 19, 2019
  11. creatorcake

    creatorcake Junior Member

    Joined:
    Jul 6, 2015
    37
    16
    0
    Location:
    41.1952133,-73.288405
    Vehicle:
    2012 Prius
    Model:
    Three
    yes maybe it was but not 100 percent sure. i wasthinking it might be ac pressure switch do you know how to test sewitch and or relays
    i will check wiring tommorow.
     
    #11 creatorcake, Feb 19, 2019
  12. ASRDogman

    ASRDogman Senior Member

    Joined:
    May 29, 2018
    5,898
    3,162
    0
    Location:
    Florida
    Vehicle:
    2010 Prius
    Model:
    Two
    Pressure switch doesn't control the fan. It just tells the system there is enough pressure to run the system.
    I would check for a pinched wire. Or a damaged wire that might short out when the fan kicks in. Maybe touching the engine block? Since everything worked before replacing the pump(correct?), except the pump, then you had the problem afterward, it's safe to say something likely was damaged during the replacement.
     
    #12 ASRDogman, Feb 19, 2019
  13. ChapmanF

    ChapmanF Senior Member

    Joined:
    Mar 30, 2008
    23,278
    15,075
    0
    Location:
    Indiana, USA
    Vehicle:
    2010 Prius
    Model:
    IV
    The repeated blowing of a fuse tells you for sure there is an electrical problem for you to solve.

    The fans are wired in an interesting way. Toyota got a low speed and a high speed out of them, by arranging with the relays to rewire them from parallel to series. When low speed is wanted, the two fans are in series across the 12 V supply, so each one sees about 6 volts. For high speed, the two fans are paralleled so each one sees a full 12 volts.

    A fairly common somebody-goofed-with-fan-wiring syndrome is where one of the fans is open-circuited, which means the low speed (series) mode can't work at all, and as a result the car calls often for high speed, and only one fan runs, cycling on and off and on and off always at top speed.

    Your observation that the non-running fan spins for a couple seconds when the running fan stops is kind of intriguing. I think it shows the fan itself is ok and the problem is upstream in the wiring. The couple-seconds-of-running I suspect is just that fan receiving the inductive kick from the running one at the instant the relay opens.

    My recommendation: refer to the wiring diagram, and just check point by point until you find the issue, ignoring anyone on PriusChat who says anything in conflict with what the diagram shows. :)
     
    #13 ChapmanF, Feb 19, 2019
  14. scona

    scona Active Member

    Joined:
    Dec 10, 2013
    225
    206
    0
    Location:
    Courtenay, BC, Canada
    Vehicle:
    2013 Prius v wagon
    Model:
    N/A
    You might have fan motor problems. Here is a link to a previous thread on the situation.
    AC Fans | PriusChat
     
    #14 scona, Feb 19, 2019
  15. creatorcake

    creatorcake Junior Member

    Joined:
    Jul 6, 2015
    37
    16
    0
    Location:
    41.1952133,-73.288405
    Vehicle:
    2012 Prius
    Model:
    Three
    Ok thanks for the info so will add some more information now. I was searching for the problem today but no luck yet. An interesting thing that I noticed was the car does not overheat if I keep the a.c. off. I did find a suspect spot in wiring but I'm not sure it is something that is part of the fan wiring. underneath the intakemanifold is a sensor in the block at least I think it's a temp sensor but not sure it was hard to get to but I pulled off connector and cleaned it well and replaced on sensor but fuse still blew as soon as I turned on a.c.. also it it DoD not blow with only heat on strange but maybe a clue. What is the place online I can get wiring diagram from Toyota? Thanks again I won't give up toll solved. I will try again tommorow.
     
    #15 creatorcake, Feb 20, 2019
  16. creatorcake

    creatorcake Junior Member

    Joined:
    Jul 6, 2015
    37
    16
    0
    Location:
    41.1952133,-73.288405
    Vehicle:
    2012 Prius
    Model:
    Three
    Oh one more thing I meant to mention is there's a strange whistling sound down by the water pump thermostat and AC compressor which are all in the same place you probably know that. I wasn't able find it exactly but today I purchased a stethoscope so that I can. Also I'm not sure the whistling sound has anything to do with this but just in case I mentioned it thank you guys again
     
    #16 creatorcake, Feb 20, 2019
(You must log in or sign up to post here.)