Filling; Changing - MerCruiser 350 MAG Owner's Manual

5. The coolant level should be between the "ADD" and "FULL" marks.
6. Add the specified fluid as necessary.
Tube Ref No.

Filling

Using propylene glycol antifreeze in the closed cooling system can damage the cooling
system or the engine. Fill the closed cooling system with an ethylene glycol antifreeze
solution suitable to the lowest temperature to which the engine will be exposed.
Without sufficient cooling water, the engine, the water pump, and other components will
overheat and suffer damage. Provide a sufficient supply of water to the water inlets during
operation.
Air trapped in the closed cooling system can cause the engine to overheat, resulting in
engine damage. Minimize the possibility of trapping air when initially filling the closed
cooling system by positioning the boat so that the front of the engine is higher than the
rear of the engine.
NOTE: Add coolant only when engine is at normal operating temperature.
1. Remove the fill cap from the coolant recovery bottle.
2. Fill to the "FULL" line with the specified coolant.
Tube Ref No.
3. Install the fill cap onto the coolant recovery bottle.

Changing

Contact your authorized Mercury MerCruiser dealer.
90-864195072 OCTOBER 2007
Description
Extended Life Antifreeze/
122
Coolant
Description
Extended Life Antifreeze/
122
Coolant
6102
Where Used
Closed Cooling System
NOTICE
NOTICE
NOTICE
Where Used
Closed Cooling System
Section 5 - Maintenance
Part No.
92-877770K1
Part No.
92-877770K1
Page 65