C2 327 overheating

[Vetteman]

Hi Folks, I have recently acquired a fabulous 327 1965 C2

Only issue is overheating, its is just all over the place. Its runs hot then gets really hot, cools down a bit but always well above 180 bit never settles at one steady temperature.

Tried the obvious changing thermostat and sender, made no difference.

Any ideas welcome.

TIA

 

[Roscobbc]

Could be one or a number of the following things causing the problem.
Radiator partially internally blocked with crap caused by no coolant/antifreeze used at some earlier point. Engine block cooling galleries the same issue. Water pump vanes eroded (same reason). Radiator hoses collapsing and restricting flow (missing internal 'spring'). It the fan is a viscous coupled type....(failure of unit) Ignition timing too far retarded. Thermostat failure (seized).
Some higher powered engine options may struggle even with typical UK summer temperatures. Is this a recent thing over the last few weeks? (and coinciding with hot weather)