Just had a look at you topics on this and I would say you are chasing a problem you have been told you have thst you may not have.
First thing I would always do with an over heating problem is pull the thermostat.and check it in some boiling water for movement.
I would also be checking for the fan coming on.
Radiator replacement is only really needed if it leaks.
Water pump replacement only if it leaks or dies not pull water out of the expansion tank wow hen revving.
The "switch" to allow the water to flow into the heater matrix (guess the MPI is no different in operation to older) is it actually opening and closing allowing water to pass?
Have you done a compression test or a test for trace in the water?
Is the timing right?
You may be chasing the wrong thing.
Probably am. I have had a cooling problem for years. No one has fixed it. I've fed up with visiting mechanics and so have decided to learn it all myself. Even if I have replaced perfectly working parts, at least I've learnt something.
The radiator turned out to be fine.
The fan comes on when it should
Water pump did leak but the bolts weren't exactly tight. It looked old anyway so I'm happy i replaced it. Interesting point though, the bolts were covered in oil that stank of petrol.
I don't know what switch you refer to
I don't know what a compression test is. We pressurised the cooling system to 1 bar, if that's what you mean
I don't really know what timing is
I am almost certainly chasing the wrong things. But eventually I'll get something right. Still cheaper than having it done for me. I have took it to Mini specialists, even ones recommended by clubs. No use. No love for my little car.
Edited by JamesMiniMealor, 16 March 2017 - 09:25 PM.