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Hi Howard I have to buy new seals so I will just get 5 litres of coolant from the Honda dealership. I phoned Rock Oil this morning and they confirmed that it isn't Silicate free. Pump off now and replacement from a low mileage model ordered from that auction site, less than 10k so hopefully still on factory coolant. Mine is on 40k and the system has had 2 Rock Oil Kool coolant changes and various top ups after valve checks so retiring the old pump and flush everything with fresh water. I suspect the hard part will be fitting the replacement.

Hi Howard. That sounds difficult, the manual suggest splitting the pump and removing it in two halves, I am going to try that first and see what the state of the pump internals are.

Nasty! Unfortunately it is a double whammy if you unscrew the cap on a pressurised cooling system before it has cooled. Even though it might not have been boiling before, if you suddenly depressurise a vehicle cooling system, it is possible that the water inside will be hot enough to come to a boil instantly once the pressure is reduced to normal atmospheric pressure. So, when you do this the water very suddenly and explosively starts to boil, i.e. turn into its gaseous form which is steam, and this gas expands the volume of the coolant and forces water and steam out of the small opening at

ffs....