For some reason in my 2007 Mini Cooper s I have a coolant issue I replace everything but the Radiator radiator and air still getting into the system and I don’t kno what to do and I’ll drive the car and the coolant not flowing. I’ll get the Low coolant warning open the cap and it will all shoot put the Radiator. Someone plz help me running out of options I just keep wasting money on the car

 

How many miles on the car?

The cooling sytem operates under pressure, not a good idea to open the cap on the coolant reservoir while the engine is hot. There are a couple of typical places for coolant to leak on the N14 and N18 engines: at the thermostat, where it will be visible on top of the transmission, and at the water pump. If you have replaced those and are still losing coolant then you may have a leaking head gasket, where pressure escapes from one or more cylinders into the cooling system. There is a simple test kit you can buy at the autoparts store to diagnose that.

 

I can't pretend to know what I am talking about, but I did watch a video on the thermostat where they cautioned that you have to mark the electrical connectors so that you put them back on the correct sensors. Also I was struck by how many hoses are on the thermostat, and that it might be a challenge to remember where each one goes.

 

Bleeding the system is crucial. My recommendation is to completely remove the bleed screw (in case if it's on the thermostat) and fill until coolant comes out if it. Slowly fill. Use a flashlight to see if water comes out of the screw hole. Slowly keep on filling until it's flush with the top. Then gently put the screw back. Don't lose it.

Then for sure fill the expansion tank properly.

All when cold.

 

By the way, don't 'fill' the expansion tank, it only needs an inch or so of coolant when cold.

 

The thermostats stay closed until they reach 108C

You can connect a scanner and watch the coolant temp or use the onboard diagnostics to view.

Basically the coolant to the rad is bypassed in the thermostat housing until the engine reaches the 108degrees.
then the ecu allows the solenoid to open, and allow flow.

That my understanding of it, perhaps someone can confirm, so that we are all on the same page.