Question on Thermostat Replacement

Hi, I have a mini one diesel 1.4, I have a few problems!
I'm getting a bubbling noise behind dash, my rad fan comes on all the time, no heat from heaters, topped up with 2ltrs of water over 700miles, had head gasket checked with the colour change test on header and came back ok. Any ideas please. Thanks

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[Nick at Pelican Parts]

Could be a coolant leak, allowing air in the system. Then you hear it in the heater core. That is if the head gasket checked out OK.

- Nick

[Dave at Pelican Parts]

There's definitely air in the system. How it got there is the real question. Check around the water pump and the thermostat housing. The latter really likes to leak on the 2007-2013 Cooper models; not sure about the diesel but it is worth looking.

--DD