R56 thermostat housing split

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  1. #1
    Test Passed Harmchar's Avatar
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    Mar 2018
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    That's me joined the list of owners that have suffered coolant loss due to split thermostat housing. What were MINI thinking making this out of plastic?
    Anyone know if there is an upgrade option to change to steel one. Bit of a long shot. But I would have liked to purchase an improved item instead of fitting like for like. Better than having the worry that it will probably happen again. Lucky I was only 1/4 mile away from house when the steam blew out. Might have known about it sooner if there was coolant temp gauge fitted in the car as standard. (like every other car I know about)
    Even with all its downfalls, still loving the MINI though.

  2. #2
    My header tank had a hairline crack in it. Had to rebuild my engine as it overheated and fried everything.


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  3. #3
    Test Passed Harmchar's Avatar
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    Mar 2018
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    Mine looks like it started as a leak from the coolant reservoir grommet that goes in the top of the rad. It's completely gone now. Can only assume I had been losing coolant over last few trips and it's overheated which caused the thermostat housing to split. Sitting in road works when it happened. Hoping the housing and grommet are the only problems. Won't find out till the new parts arrive on Tuesday and get the system topped up again.
    Hope I don't have an engine rebuild like you. Although a head decoke would be good.......

  4. #4
    Took 6 weeks was a total nightmare.


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  5. #5
    Want More BHP!
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    Mar 2014
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    I just replaced a cracked thermostat housing.... well my local friendly mechanic did as I watched a few videos and figured my patience would run out.
    Fortunately I heard a bubbling after I came home one night so fingers crossed my topping up caught it before it did any damage.

  6. #6
    Test Passed Harmchar's Avatar
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    changing thermostatic housing wasn't that bad a job, just tight for bigger hands. Took a few runs to get all the air out of system. Looks like I got home before engine boiled and did more damage.
    Wait to see what happens next.

  7. #7
    Site Owner badwolf340's Avatar
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    Quote Originally Posted by Harmchar View Post
    changing thermostatic housing wasn't that bad a job, just tight for bigger hands. Took a few runs to get all the air out of system. Looks like I got home before engine boiled and did more damage.
    Wait to see what happens next.
    Good that’s it’s good to go and no further damage
    The cars in front are New MINI Scotland



  8. #8
    Pleased that you got it sorted with no further damage
    MINI F56 John Cooper Works Challenge 20 - JCW Shift Light, JCW Pro Mats, JCW Carbon Fibre Gearknob, JCW Pro Diffuser, Chilli Red Engine Cover, Carbon Fuel Filler, Black Door Handles, DuellAG Splitter, DuellAG Carbon Fibre Spoiler, Airtec Intercooler, AWE Tuning S-FLO CAI, RSI Carbon Fibre Big Scoop, Mintex Challenge Track Pads - Still More To Come

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