So I am having a wyrd problem with my MG ZR, its a 1.4 petrol model, 04 plate.
The car starts to overheat after being driven for a while.
It starts fine and runs fine, idles consistently without any wyrd sounding changes in noise. There is no 'mayonaise' on the oil cap, the dipstick just has clean oil on it and there is not oil that I can see in the coolant or on the coolant cap.
I thought it may just be an airlock or something so decided to check that. So I removed the coolant cap, and removed the metal bleed screw (literally fully removed the screw). At this point the expansion tank is full but nothing is coming out of the bleed screw hole and the level of water in the tank remains the same. What does this indicate?
If I squeeze the upper and lower radiator tubes then water goes in/out of the expansion tank but I have not seen any water at all coming out of the bleed screw hole.
Any advice would be much appreciated