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Member
Don Thermostat
Don on a 7 year old 150 (sn1B947225) with 400 hours do you recommend changing the thermostat as a preventive maintenance item?
Tournament-Fishing \"It\'s not a question of if you will be humbled but how many times\"
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Mercury 3L/4 Stroke/Verado Moderator
I would base replacement on an inspection (and test) of the thermostat. If it does not close properly, open properly, or exhibits any corrosion: REPLACE it.
Inspection/testing of the thermostat is part of the Annual Maintenance.