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Coolant Expansion Tank Cap won't trun

This is a discussion on Coolant Expansion Tank Cap won't trun within the CLA General Discussion forums, part of the Mercedes-Benz CLA Forum category; Hi, I tried to open my 14 CLA250 coolant expansion tank cap, but it only turns about 1/4 turns, and stuck from there and on. ...

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Thread: Coolant Expansion Tank Cap won't trun

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    Coolant Expansion Tank Cap won't turn

    Hi,

    I tried to open my 14 CLA250 coolant expansion tank cap, but it only turns about 1/4 turns, and stuck from there and on. (Engine was cold)
    The cap is loose at that point, I can wiggle it, but won't turn any more.
    I tried to push it down while I am turning, no luck.

    So, I tried my ML to compare, and it turns without even pushing it down ...

    Any thought?
    Last edited by mbsang; 02-27-2019 at 09:25 AM.

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    jmc
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    Should just turn like any bottle cap
    Try a little more torque?

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    Quote Originally Posted by jmc View Post
    Should just turn like any bottle cap
    Try a little more torque?
    I tried again, but the result is the same. I can open it a bit (up to that point is is freely rotatable), then seems like it is hitting some sort of locking system, and not turning any further.
    I may need to bring it to my dealer to see if they can open it up for me.

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    jmc
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    Quote Originally Posted by mbsang View Post
    I tried again, but the result is the same. I can open it a bit (up to that point is is freely rotatable), then seems like it is hitting some sort of locking system, and not turning any further.
    I may need to bring it to my dealer to see if they can open it up for me.
    how many turns does it rotate "freely"

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    About 1/4 turns, and it seems hitting something...

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    jmc
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    Oh ... thats the free play in the cap lock system
    Might just be a sticky seal ... it will feel like a hard mechanical stop (like mine was the first time I tried to open)
    Give it a little more twist force?
    But then again maybe let the dealer service guy do it ... worse case is a duh! moment

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    Quote Originally Posted by jmc View Post
    Oh ... thats the free play in the cap lock system
    Might just be a sticky seal ... it will feel like a hard mechanical stop (like mine was the first time I tried to open)
    Give it a little more twist force?
    But then again maybe let the dealer service guy do it ... worse case is a duh! moment
    Good to know... thanks,

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