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SD1too · 17th October 2019, 16:05

Pete, three important points for you:

Your thermostat isn't faulty.
You need to stop the leak you've identified. It will prevent the cooling system pressurising properly and cause the variable temperatures you are experiencing.
Did you refill and bleed the system according to the MG Rover procedure? Crucially, did you refit the bleed screw before starting the engine and did you raise the expansion tank?

Simon

17th October 2019, 16:05	#5
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,380 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Pete, three important points for you: Your thermostat isn't faulty. You need to stop the leak you've identified. It will prevent the cooling system pressurising properly and cause the variable temperatures you are experiencing. Did you refill and bleed the system according to the MG Rover procedure? Crucially, did you refit the bleed screw before starting the engine and did you raise the expansion tank? Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.