Hi all having issues with my 2005 mini one.

So I'm quite sure I've got fumes getting into my coolant. So I decided to try a gasket seal. Removed the thermostat and added where stated on the install instructions.

So put everything back in place and when I turn the key the temp gauge goes to max car hasn't run in days. I replaced the coolant sensor incase this was at fault no change. I was out again today removed the thermostat completely in the hope to run for a bit without restricted coolant movement. After removing the battery box and all and replacing the car started with normal temp reading. However after running for 15mins to allow the sealer to do its thing I replaced the thermostat and all the rest its now back to high temp and wont start its turning over but no start battery is good starter is good 👌  I'm thinking loose cable ? Due to the freak start then back to not starting has anyone got any ideas here ? 

 

Thanks in advance 

Morning Brian

The last mini I had was in the 1960's but here goes ??

What made you think there were "fumes" in the header tank if you have a head gasket issue I am not sure whether the additives will work.

As for the temp gauge it would appear that there is a dead short so I would back track through what has been removed to see if a cable is pinched damaged  (check all insulation) or in the wrong place. Check www.realoem.com put the last 7 digits of your Vin number in the search box it will bring up your model. Search the relevant sections for information there are small exploded drawings which will help to understand what goes where, plus the correct part numbers for replacements

Dave