Thread: over heating shorty

is it holding pressure?
if not look for the leak.
if heater fitted try blocking it off.
use a cleaner fluid to clean block incase a blockage in the block.
does it have a buypass from the pump or a release hole on the thermostat?
is the vacume advance working correctly?

did it start to overheat suddenly or was it a slow build up till it got to bad to drive.
ie sudden failure or slow build up.

had an old holden gemini once used to over heat only when driving but when idling would run cool would also cool down quick like you said,
we tried the radiator and thermostat, waterpump still did the same thing then out of frustration i revved the **** out of it and held the throttle flat, to my amasement the bottom radiator hose had sucked flat, totally collapsed when returned to idle the hose would pop back out, we put a spring in the hose so it coul not collapse he presto problem solved!

it might be worth checking this if you have not already,
good luck...

I would check for vacuum leaks in intake, leading to a weak mixture. Perhaps something to do with the crankcase ventilation system, or a leaking manifold gasket. (It does have the correct carburetter?).

Also, another suspect would be whether the distributor centrifugal and vacuum advance are working properly.

John