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Old 6th July 2018, 20:14   #4
Sonic ZS
Posted a thing or two
 
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Quote:
Originally Posted by mbonwick View Post
Running it with the expansion cap off is meaningless, as it is a pressurised system.


Hardly surprising that the coolant starts to boil with no pressure to stop it.
How does it do with the cap on?
Sorry, but not sure why you think the cap was off ? All of the observations noted were with the new cap securely in place ! : The volcano effect can be seen through the translucent plastic of the header tank.
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