Oh ... as a side note ... you don't need to take the hoses off the thermstat cover .... the unbolt ... release the little bit of coolant (will pour out a little) ... then lift the housing off ... swap thermostat (just sits in place) ... reverse procedure.
If the header tank is full ... you will not need to top up what you have lost really ... will only lose about 100mm ... not even that much ... doubt you'd even need to top the coolant up either.
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