22-04-2019, 08:58 PM
(This post was last modified: 22-04-2019, 08:58 PM by Reckless Rat.)
If you look into the radiator from the filler hole you should be able to see a semi circular cut out in the filler neck. Ideally fill the radiator to the bottom of that, or it will just spit it out through the cap or the overflow.
However, assuming your car has a fan (some specials don't) then the capacity of the the thermosyphon system is usually large enough to cope and prevent overheating. In your case, either there is some restriction in the radiator (a back flush might help) but a more common problem is that of the galleries in the head & engine block have become blocked with rust and crud. To clear them will need a cylinder head removal as well as the side water branch. Be particularly careful though if you have to remove it because the corrosion can cause studs to shear off. Once removed you can poke, prise or blow the muck out. It will make a considerable difference to cooling.
Good luck.
However, assuming your car has a fan (some specials don't) then the capacity of the the thermosyphon system is usually large enough to cope and prevent overheating. In your case, either there is some restriction in the radiator (a back flush might help) but a more common problem is that of the galleries in the head & engine block have become blocked with rust and crud. To clear them will need a cylinder head removal as well as the side water branch. Be particularly careful though if you have to remove it because the corrosion can cause studs to shear off. Once removed you can poke, prise or blow the muck out. It will make a considerable difference to cooling.
Good luck.