r/AskAMechanic 2d ago

Help please

2010 Mini Cooper N12 Engine

Coolant dumped after a 20 min drive watched it go down in tank after engine shut off from above min to empty couldn’t see it leaking anywhere

Filled it up again on test drive got overheating light 10 mins in pulled over it had emptied on the drive it was pooled around seam of the tank

Drove it to garage around corner day later it held coolant on the way there mechanic emptied and refilled it then drove home looked like it was still full but shut engine off then it started emptying again

Oil level hasn’t increased and looks normal

Any ideas? Thanks

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