Bye bye Honda...
Car: Volvo V60 VEA D4 (181)
Join Date: 11th May 2012
Location: Ludlow, UK
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WHEN THE ENGINE IS COLD (!!!) remove the cooling system cap and look for any obvious signs that the cap or seal is damaged. Do also check that the coolant level is correct.
A faulty thermostat would either result in a longer warm up than normal if stuck open, or over-heating if stuck closed (which would be indicated as a higher-than-usual temperature on the gauge).