Hey guys, I have a 2008 Mini cooper S R56, 40,000miles on the clock.
I have had the thermostat housing replaced as it was leaking by a recomended mechanic, turns out he's not the best!?
He has fitted the housing but the car keeps overheating and blowing coolent out of one of the ports on the housing, i belive its the one that goes to the water pump. I have had a look at it myself (though repairing cars isnt my thing!) I watched a few you tube videos on the fitting of this part and learnt there is a bleed valve on the housing itself, i opened this and alot of air came out and coolent level in the res dropped as expected. i started the car and let it get to temp and repeated this process to let any remaining air out the system.

I took the car for a spin and very quickly the car started steaming from under the bonnet, i could identify the leak from the same spot as before on the the thermostat housing. Also the coolant in the res was really hot to the point it was bubbling!

Hopefully someone out there can give me some advise before i take it to the dealership and have to pay hefty repair bills!

Thanks guys let me know if you need any other info!

Thanks again!

 

he probably did not replace the O ring for the pipe from the thermostat to the water pump, had this happen to a customer's car and after replacing the o ring problem went away(the O ring was torn into 2)

 

Answered here:

https://www.northamericanmotoring.co...rmostat-6.html