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

Radiator Fan Motor Intermittently Failing

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by Taylor Page, Sep 22, 2023.

  1. Taylor Page

    Taylor Page New Member

    Joined:
    Sep 22, 2023
    1
    0
    0
    Location:
    Portland, OR
    Vehicle:
    2009 Prius
    Model:
    N/A
    Hello,

    I recently had my 2009 Prius in the shop. They found a leak in the upper radiator hose connection and fixed that. From further testing they found the passenger side radiator fan was not cycling properly. The mechanic tapped the fan motor, and it started working normally so they suspect the fan motor is intermittently failing. It is a costly repair so I'm wondering how far I can reasonably drive the car before replacing it. Alternatively, is this something I can check every time I start the car and make sure the fan is working? Any help is appreciated, I'm not very knowledgeable about cars.
     
  2. Leadfoot J. McCoalroller

    Leadfoot J. McCoalroller Senior Member

    Joined:
    May 12, 2018
    7,177
    6,728
    1
    Location:
    Pennsylvania
    Vehicle:
    2018 Prius c
    Model:
    Two
    Overheating an aluminum engine is even more expensive. Do the repair soon.

    You really don't want a dealer doing this repair- they're required to use new parts, so it would be very expensive. But the good news is that any mechanic can swap radiator fans.

    Cheapest fix is probably a used fan assembly taken from a junkyard/recycler installed yourself. Next cheapest would be the same work done by the neighborhood mechanic.
     
    jerrymildred likes this.
  3. Tombukt2

    Tombukt2 Senior Member

    Joined:
    Nov 29, 2020
    9,158
    1,609
    0
    Location:
    Durham NC
    Vehicle:
    2009 Prius
    Model:
    Base
    You're heading into the cold season. So that fan won't matter that much Yes if you wanted to you can tap on it every time you start the car tap on it with a light metal object and you'll probably knock the carbon pieces around enough to where it'll stay running for another year probably and cycle on and off without much to do. And it's not a very expensive repair actually your teenager can probably do it or what have you It's actually a very easy repair one of the easier ones you'll get on this model car.
     
  4. BiomedO1

    BiomedO1 Senior Member

    Joined:
    Mar 27, 2021
    1,481
    801
    0
    Location:
    SacTown, Ca
    Vehicle:
    2021 Prius Prime
    Model:
    LE
    Welcome!!!
    As long as one fan is fully operational, your good. While not ideal, you'll usually need that secondary fan in 95+ degree weather, plus stop and go traffic or long runs up the mountain @ less than 30 mph, with the AC running. As long as the car is moving, (ie: 35 mph); there's a 35 mph breeze going through your radiator - that's usually enough to keep the engine happy. If your not sure, turn off the AC, that will reduce the cooling load on the car, switch the HVAC to manual control - to prevent the AC from automatically turning on. These modern, efficient engines don't really generate as much heat as the old ones.

    A replacement fan assembly ranges from <$75 on ebay and up to >$150+ on Rockauto. The replacement should take about an hour to hour and a half, can be done at any general auto repair facility. It's a fairly simple and straight-foward job.

    Both cooling fans was dead in my friends Honda CRV. According to him, his wife has been complaining that the temperature gauge has been going over the mid-way point for the past 3 years - and sometimes the AC would blow warm air. That would go away in the winter, but the issue would return when summer temperatures got over 100 degrees. I knew it was at least one dead cooling fan, right away. He didn't believe me, so we unplugged each fan and jumped it directly to the battery. To his surprise, both was inop....

    Hope this helps...
     
    #4 BiomedO1, Sep 23, 2023
    Last edited: Sep 23, 2023
  5. pasadena_commut

    pasadena_commut Senior Member

    Joined:
    May 2, 2019
    1,494
    449
    0
    Location:
    Southern California
    Vehicle:
    2007 Prius
    Model:
    N/A
    Umm, not so much? Unlike most cars there just isn't enough clearance between the fans and everything else in the engine bay to just unbolt them and move them in or out. From the videos I have seen the radiator needs to be at least tilted forward, if not removed entirely, and in many scenarios it would need to be drained and refilled. Getting the air out of this car's cooling systems takes quite a long time. So, yes, any mechanic could do it, but it might take a while.
     
    jerrymildred likes this.
  6. jerrymildred

    jerrymildred Senior Member

    Joined:
    Oct 28, 2016
    11,515
    14,118
    0
    Location:
    Tampa, FL
    Vehicle:
    2017 Prius
    Model:
    Two
    I believe @pasadena_commut is right. In the shop where I sometimes help out, they always pull the whole radiator to replace the fans. It must not be too hard to do because I think getting the intake ducts and the intake manifold out of the way looks like it should work and I've had those out dozens of time. I just haven't done a rad yet.
     
  7. mr_guy_mann

    mr_guy_mann Senior Member

    Joined:
    Sep 3, 2020
    3,475
    1,554
    0
    Location:
    NJ-USA
    Vehicle:
    2006 Prius
    Model:
    Four
    That fan motor is bad and not reliable. Any time the system tries to turn it on, it might work, or it might not.

    In the vey short term you can live with it (I would not use A/C). However, I would plan on repairing soon. Why? - because the other fan is the same age and has had the exact same use. The only way you would know if both fans went out was that the A/C went warm (because pressures shot through the roof) &/or the engine overheated.



    Posted via the PriusChat mobile app.