The nozzle on the top of the coolant tank broke off, is it safe to drive?

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Thread: The nozzle on the top of the coolant tank broke off, is it safe to drive?

  1. #1
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    The nozzle on the top of the coolant tank broke off, is it safe to drive?

    The nozzle on top of the coolant tank broke off as I was moving the tank out of the way to disconnect some sensors. Attached is a stock picture of the tank with the area that broke circled in red. There's about a 1/4in piece left that's reinforced with plastic bars on the top and bottom and that piece didn't break off. I dremeled the bars away so I could fit the hose over that piece. I'm not sure if it will hold though, like if the tank is pressurized I doubt it.

    Is it safe for me to drive the car to pick up a new coolant tank from VW (hopefully)? What happens if that area is not connected, will all the coolant leak out?

    coolant tank broken nozzle.jpg

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  3. #2
    Neutral Maqcro's Avatar
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    Yes the coolant will leak out. Think of reservoir cap as the radiator cap, it’s under pressure.

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  6. #4
    in dire need of an organic chemistry lesson
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    Make sure you buy a genuine reservoir. The after market ones won't fit or last long. The stealership will charge you more but I think it's worth it since you won't have any worries afterwards in terms of cracks or misfits.

  7. #5
    Neutral Tortelious's Avatar
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    That is, I believe, a return line. If you have to drive the vehicle, just don't tighten the cap down. No pressure will build up, and it won't leak out the top.
    ylwagon likes this.

  8. #6
    in dire need of an organic chemistry lesson
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    Quote Originally Posted by Tortelious View Post
    If you have to drive the vehicle, just don't tighten the cap down. No pressure will build up, and it won't leak out the top.
    But the leak is not just because of the pressure. When car drives the coolant moves violently within the reservoir as you climb up and down the potholes. There will be some leaks anyway.

  9. #7
    3rd Gear axenstar's Avatar
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    The coolant flows through that when thermostat opens. I wouldn’t drive like that. The car will overheat


    Sent from my iPhone using Tapatalk

  10. #8
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    I think that it's safe to drive to the parts department. As Tortelious said, leave the cap loose (or off) and the hose should stay on that stub long enough. Even if it came off, coolant loss would be at a pretty low rate.

  11. #9
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    Thanks guys. I ordered a new OEM reservoir from VW so I pick that up this afternoon. I decided to MacGyver the broken nozzle by drilling through the remaining piece of nozzle and hose with 1/16" bit and leaving the bit in place and dremeling off the excess. So hopefully it has a better chance of holding. I'll let you all know what happens...

    coolant tank nozzle drilled 1 of 3.jpg

    coolant tank nozzle drilled 2 of 3.jpg

    coolant tank nozzle drilled 3 of 3.jpg
    jjpark likes this.

  12. #10
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    I picked up the new reservoir without issue. I left the cap on the old reservoir and the hose held and the coolant stayed at 190 degrees. To anyone trying the drill bit technique I forgot to mention I had cleared the plastic debris from inside the nozzle that was left over from the drilling so it wouldn't enter the coolant.
    VAGguy and jjpark like this.

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