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  • FIRST POST
    • Purple Hello Kitty
    • By Purple Hello Kitty 7th Jan 18, 7:34 PM
    • 6Posts
    • 1Thanks
    Purple Hello Kitty
    Car coolant expansion cap help!
    • #1
    • 7th Jan 18, 7:34 PM
    Car coolant expansion cap help! 7th Jan 18 at 7:34 PM
    Hi Im looking for some advice my current car coolant expansion has cracked. Ive been informed I can only get a replacement at my local ford garage which is fine but I saw i need some sort of silicone to go with it? Do I need to use a specific one from ford? Or can i buy one myself from halfords and take it to a garage to sort it as i have no idea what im meant to do with the silicone? Also any ideas of how much this will cost? Btw I have a ford fiesta 62 reg TIA
Page 1
    • ohreally
    • By ohreally 7th Jan 18, 7:37 PM
    • 6,650 Posts
    • 5,185 Thanks
    ohreally
    • #2
    • 7th Jan 18, 7:37 PM
    • #2
    • 7th Jan 18, 7:37 PM
    Is this what your looking for?

    https://www.ebay.co.uk/p/Ford-Fiesta-Mk7-2008-2017-Expansion-Bottle-Overflow-Tank-8V218K218B/1973091969?thm=3000

    Or is it simply a cap?
    • arcon5
    • By arcon5 7th Jan 18, 8:18 PM
    • 13,572 Posts
    • 8,616 Thanks
    arcon5
    • #3
    • 7th Jan 18, 8:18 PM
    • #3
    • 7th Jan 18, 8:18 PM
    Never known any to require a silicon. The cap should have a seal built in and the pipes will have jubilee clips to secure them.
    • forgotmyname
    • By forgotmyname 7th Jan 18, 8:28 PM
    • 27,187 Posts
    • 10,954 Thanks
    forgotmyname
    • #4
    • 7th Jan 18, 8:28 PM
    • #4
    • 7th Jan 18, 8:28 PM
    A bit of silicone grease to lubricate the seal and extend its life?
    Punctuation, Spelling and Grammar will be used sparingly. Due to rising costs of inflation.

    My contribution to MSE. Other contributions will only be used if they cost me nothing.

    Due to me being a tight git.
    • funguy
    • By funguy 7th Jan 18, 8:31 PM
    • 546 Posts
    • 820 Thanks
    funguy
    • #5
    • 7th Jan 18, 8:31 PM
    • #5
    • 7th Jan 18, 8:31 PM
    Is this a Ford ecoboost engine?
    • Purple Hello Kitty
    • By Purple Hello Kitty 7th Jan 18, 10:45 PM
    • 6 Posts
    • 1 Thanks
    Purple Hello Kitty
    • #6
    • 7th Jan 18, 10:45 PM
    • #6
    • 7th Jan 18, 10:45 PM
    Its just the cap im after.
    • Purple Hello Kitty
    • By Purple Hello Kitty 7th Jan 18, 10:51 PM
    • 6 Posts
    • 1 Thanks
    Purple Hello Kitty
    • #7
    • 7th Jan 18, 10:51 PM
    • #7
    • 7th Jan 18, 10:51 PM
    Sorry have no idea how to use this forum...do you think if I buy just the cap from ford I should be okay? Apparently the reason my last cap snapped was because I bought it from and never put the silicone stuff around it and it expanded and cracked. I find the whole thing confusing and I didnt just want to roll into ford asking them for the cap and this silicone stuff and look like a complete idiot!
    • Purple Hello Kitty
    • By Purple Hello Kitty 7th Jan 18, 10:52 PM
    • 6 Posts
    • 1 Thanks
    Purple Hello Kitty
    • #8
    • 7th Jan 18, 10:52 PM
    • #8
    • 7th Jan 18, 10:52 PM
    Funguy no its not a ecoboost engine
    • arcon5
    • By arcon5 8th Jan 18, 6:53 AM
    • 13,572 Posts
    • 8,616 Thanks
    arcon5
    • #9
    • 8th Jan 18, 6:53 AM
    • #9
    • 8th Jan 18, 6:53 AM
    Yes just a new cap should suffice.
    I've never known anybody to put a silicone around the cap due to risk of contaminating the coolant. But then I've never worked for dealerships, only independants
    • facade
    • By facade 8th Jan 18, 7:50 AM
    • 3,200 Posts
    • 1,686 Thanks
    facade
    What happens to these is the tank distorts somehow (I don't know why), and the cap leaks, blowing coolant out as soon as the engine is hot. One "solution" is to over-tighten the cap which can cause something to crack.

    You might get away with just a new cap, or you may need a new tank and cap, they are not very expensive as Ford sell so many.
    I want to go back to The Olden Days, when every single thing that I can think of was better.....

    (except air quality and Medical Science )
    • mrmechanic
    • By mrmechanic 8th Jan 18, 4:23 PM
    • 103 Posts
    • 123 Thanks
    mrmechanic
    The main problem is the rubber o ring on the cap binds to the neck of the bottle. When you try to unscrew the cap it splits in two leaving the base firmly stuck in the neck of the bottle with the top of the cap in your hand
    The 2 seals need to be lubricated with either a silicon grease or spray.
    If not then the same thing will happen to the new cap.
    If it isn't broken, don't try to fix it.
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