Join Date: Jan 2005
Car: Other Manufacturer. Previously - more Rovers than I care to remember.
Those tests don't work very well as I mentioned in the post referred to above.
You are much better to look at the condition of the fluids and consider the symptoms you are getting.
If it was leaking gas into the cooling system as this test suggests, then the Rover cooling system quickly develops an air lock. However, it could be reading positive due to oil in the coolant. If this is the case, you will see contamination with creamy mayo scum. Or it could be reading positive due to something else in the coolant.