Hi all.

I have a 2007 R56 MCS and I'm from the UK.

I am currently having issues with the car on very cold mornings, I have a scan gauge installed and I have noticed that my car struggles to get up to normal operating temperatures. After 40 minutes of driving it sits at around 50 degrees (122f) and when its below 50 (122f) it wont boost as I believe the ECU attempts to protect the engine and it gives the yellow engine warning light on the dash with reduced power. The only code it has given is "low engine temp" The car only gets to 90 degrees (194f) if I sit in traffic for a long time, when I start to move again it goes down to 50 (122f).

I have tried replacing the coolant temp sensor that sits in the thermostat and it made no difference, It does not appear to be leaking coolant.

I am not sure what to do next, it is not covered under warranty, I am guessing its either the boost/pressure/temp sensor or I need to replace the thermostat.

Any help would be appreciated.

 

anyone?

 

Well I tried replacing just the sensor that sits within the thermostat and that did not work. We then replaced the thermostat, was a pretty easy job for the Mechanic, there were no splits in the old thermostat or signs of damage but it seemed to be faulty and constantly stuck open, so when the car was cold, it would always try to cool it as much as possible therefore never allowing it to get up to temperature.

I also noticed that the original thermostat in my car had "A1" written on it and the new unit was "B1" so its probably been revised a few times...

Car now gets upto temp fast and holds it and the ECU has stopped cutting the boost.

 

When I drove my MINI in the winter I did notice that it would not allow full engine torque output when it was really cold. You are not the only one!