I Have a 3.9 V8 Discovery and on long runs (70 miles) it starts overheating...water boiling up and wanting to escape out of the header tank, i'm sure the head gaskets are fine can anybody help ? i think it might be the Thermostat ?
I'm new to this forum, i own a Discovery 3.9 V8 and i'm having a problem with it and i am not sure what section in here to post for any help or advice...can anyone help please ?