Vilja 36.7
New member
I have a 2008 FIRST 36.7 yacht w Yanmar 3YM30/SD-20 , sea and fresh water cooled . First trip in February, cold with snow. After 30 min at low spead, got engine overheating alarm. Surprised when found almost no fresh water/cooler in cooler tank. No water in engine oil. No signs of external leakage. What can be wrong? Is top gasket blown? Leakage to sea water circuit? Grateful for the help !