Mercury Repair Questions? Ask a Mechanic for Answers ASAP
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did he change the thermostat??? it sounds like the issue. air i the system will also do this.
lastly, you may have damaged a head gasket allowing compression into the cooling system. a cylinder leak down test will confirm this.
what exactly was done in the repair??
absolutely it needs a thermostat. it regulates the circulation all around the motor. by not having the thermostat, there are areas of the motor that dont get circulation and that will cause issues.
I would have it installed and then re check the system operation.
let me know how it is
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