Ice Grille Shutter

Discussion in 'Gen 5 Prius Main Forum' started by VelvetFoot, Jan 29, 2026 at 6:12 PM.

  1. VelvetFoot

    VelvetFoot Active Member

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    Just noticed it. Solid ice. Been cold here. Drove through some snow, but perhaps the car washes were also a factor. Might try spraying windshield washer fluid on it to loosen it up.
    edit: Didn't seem to make a dent. Perhaps some judicious application of heat...what could go wrong, lol.

    upload_2026-1-29_18-12-18.png
     
    #1 VelvetFoot, Jan 29, 2026 at 6:12 PM
    Last edited: Jan 29, 2026 at 7:58 PM
  2. Trollbait

    Trollbait It's a D&D thing

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    Why worry about it? If it isn't warm enough to melt it, it isn't warm enough to need full cooling from the grill.
     
  3. VelvetFoot

    VelvetFoot Active Member

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    I know. I wonder if the auto shutters could be affected if enough ice builds up.
     
  4. Trollbait

    Trollbait It's a D&D thing

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    They can get blocked. The harm would come if they keep trying to move while stuck though.
     
  5. bisco

    bisco cookie crumbler

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  6. VelvetFoot

    VelvetFoot Active Member

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    At this point in life, all I have is a heat gun, lol.
    On low, 675 watts, a foot distance is pretty warm, so dangerous to plastic if too close, plus tedious to hold.
    I have a small personal heater, maybe 375 watts, strong fan. Can put hand right up to grill without burn. Tried that for a half hour. Made a tiny dent.
    Takes a fair amount of energy to change water's state from solid to liquid, I guess.
    I might see if the front under cover is easy to take off-maybe there's a short piece, or the like, that I could easily remove and grab the chunks. The cover traps it.
    I don't want to break anything.
    A heated garage would be ideal.
     
  7. VelvetFoot

    VelvetFoot Active Member

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    Perhaps a grille block of some sort is in order, if only to block the snow, if that's what the root cause it.
    Maybe black fiberglass window screen would stop the snow from entering. If that gets blocked it could easily cleaned if desired. Still allows air to flow. Maybe a little protection from rocks.
     
  8. Tande

    Tande Active Member

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    I've had the same problem ....DIY car wash fixed it ......
     
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  9. VelvetFoot

    VelvetFoot Active Member

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    Thanks very much. I was considering that. I’ll give it a whirl, probably. Probably even cheaper than burning the kw-hrs. More kinetic though.

    They used to have people with hoses aim at stuff like that and the wheel wells. Now they depend on the equipment mostly.

    Thing is the ice chunks, when broken up, have nowhere to go because of the cover below.
     
    #9 VelvetFoot, Jan 30, 2026 at 2:09 AM
    Last edited: Jan 30, 2026 at 2:16 AM
  10. Paul Gregory

    Paul Gregory Senior Member

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    I don't know how effective the shutters are, but I was able to install a sheet of cardboard, with about a 4" gap from the radiator. This allows airflow when its needed, and still blocks the cold airflow from preventing the interior heating from providing comfortably warm airflow.

    This is something I have done with all my vehicles, going back at least 30 years. It works well in cold weather for providing good interior heat, while not overheating the engine when temperatures get warm. In fact, the cardboard has remained in place year-around since the car was new; providing both interior heat when needed, while protecting the engine from overheating in hot weather. Just as well, because it was difficult to install, requiring some disassembly of the mounts around the front of the radiator. I don't doubt that the automatic shutters do their job, but the sheet of cardboard seems to ensure that proper airflow goes through the radiator at all times of year in this continental climate.
     
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  11. VelvetFoot

    VelvetFoot Active Member

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    Called dealer service. He offered to let me keep the car in the heated shop over the weekend, which was very nice. Alas, it's my only car, I'm single, and friendless. :).

    He said I wasn't doing any damage by letting it melt when it does naturally. I hope.

    He also indicated that spray from a do it yourself car wash wouldn't hurt things.

    The only thing, as I said, the underside of the car is pretty much covered in plastic covers-I don't think the chunks have anywhere to go.

    A peek at an online manual seems to point to a Radiator Support Opening Cover, with six bolts holding it in place.
    Also, based on the same peek, it's possible the shutters are up higher, although I'm not sure.
    I'll take a look in awhile.
    It's still -5°F outside, in 22°F in the garage. Brrrr.
     
  12. Mendel Leisk

    Mendel Leisk MMX GEN III

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    Boy, temperatures seem as much an east/west thing than north/south.

    Being on a coast with prevailing winds coming from the oceans, we’re California North. Inland it gets chilly, but we’ve got it easy here:

    IMG_3144.jpeg

    And of course, being me, the snow tires are on.
     
  13. VelvetFoot

    VelvetFoot Active Member

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    That was helpful. :)
    What, are you sticking it to me? (Seinfeld reference)
     
  14. Trollbait

    Trollbait It's a D&D thing

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    That entire grill can be covered with snow and ice at those temps with no harm from overheating. I've used partial grill blocks on cars year around without issue. The cooling systems are sized for dessert heat, and can reduce engine efficiency in the cold. It's why Toyota put active grill shutters in the car. The shutters have been in use in the US for well over a decade now. I'd expect designs considering icing up, so won't worry about them.
     
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  15. VelvetFoot

    VelvetFoot Active Member

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    You would think so.

    Even if they've designed out excessive error reporting, the overwork it could possibly be seeing might shorten its life.
    I can see a dealer replacement costing $2000. That's a wild guess-bumper removal, sensor calibration, whatever.

    Nowadays, it'd probably throw a big a$$ message that you can't get rid of on the gauge cluster.

    All for something that could be of marginal benefit, in my opinion.

    I'd prefer something easily removable, and possibly more effective, that could potentially block snow/water ingress and the subsequent huge ice buildup, homemade or not. Not something less effective, complex, and costly to replace.
     
  16. Trollbait

    Trollbait It's a D&D thing

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    The shutter isn't there to block snow and ice. It's there to block air flow. Your snow plug may not even be reaching it.
     
  17. BiomedO1

    BiomedO1 Senior Member

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    BTW; it looks like you drove it through a snow drift. Dumping liquids or blowing hot air on it is just going to solidify it. It's just a partial block; IMHO, just wait until the weather gets warm enough to take care of it. It should correct itself when it warms.
     
  18. Paul Gregory

    Paul Gregory Senior Member

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    I'm lamenting the apparent loss of the rapid coolant warming system of the Gen 3. It used engine exhaust to rapidly warm up the engine coolant on startup in cold weather. I could get the heater to put out heat in about 5 minutes with the Gen 3, but with the Gen 5, it seems to take 20 mins or more.
     
  19. VelvetFoot

    VelvetFoot Active Member

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    I just went out and took a look.
    The shutters work on the lower, most exposed grille.
    The huge ice chunk is indeed impinging on the shutter.
    It looks like the shutter is half open.
    The ice is resting on a top of the bumper-that piece I referenced above is probably past the shutters.
    What a mess.

    upload_2026-1-30_11-25-52.png
     
  20. Paul Gregory

    Paul Gregory Senior Member

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    It doesn't hurt to have a heated garage in mind for when you need it. Sometimes I have a wheel imbalance caused by uneven ice buildup inside the rim. About half an hour in the heated garage does the trick.
     
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