vinceboy Just a quick one guys. I am going to change this today. Do you just unbolt and replace or do you have to drain the coolant system?
JohnnyN Take the cap off the expansion tank. Have new sensor close to hand. Undo old, put your finger over the hole to stop too much coolant coming out, then put new sensor back in. Replace cap. Start car, in for drive upto temp and check for leaks.