I have a f78 fourtrak that after a longish drive at speed the coolant pipes were absolutely solid and i could here bubbling coming from the radiator!! the temperature gauge has stayed in the same position at just before the half marker it runs as well as it has ever done but this is bothering me slightly as am taking it abroad next wk and will be doing about 3000 miles!!!!
I dont know whether there is a bleed nipple to see if there is an air lock in the system somewhere as i have recently changed the coolant!!!
Thanks for your advice in advice regards Iain