I would suggest a comptete system flush plus take a hose with a medium
pressure nozzel and wash the radiator fins. Do noot use a pressure washer as
that would damage the cooling fins. Also remove the thermostat and heat it
in a pot of water with a thermometer along side. You can watch at what temp
it opens and determine if it is the culprit. It might be worth changing
anyhow if it's really old you might replace it but do the test to learn of
the operation of the current one for diagnostic purposes.
My .02 FWIW
George
'76 MGB driver
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