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MGB Radiator cap missing

Simon Hughes

Freshman Member
I guess I haven't been paying attention as I've just realised that I have no filler cap on my 77 MGB radiator. I assume I top up/fill through the expansion bottle.

Does anyone know why this was designed that way?




Great Pumpkin
Country flag
They went to a pressurised system. While the thing is stone cold, pull the top hose and fill both the rad and block (thermostat will be closed so expect that to be a PITA), then the bottle.
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