Mariner 2WD L4-2.5L Hybrid (2010)
Coolant Reservoir: Service and Repair
Degas Bottle
Removal and Installation
1. WARNING: Always allow the engine to cool before opening the cooling system. Do not unscrew the coolant pressure relief cap when the
engine is operating or the cooling system is hot. The cooling system is under pressure; steam and hot liquid can come out forcefully when
the cap is loosened slightly. Failure to follow these instructions may result in serious personal injury.
NOTE: The degas bottle has 2 separate reservoirs. The front (larger) reservoir is part of the engine cooling system. The rear (smaller) reservoir is
part of the Motor Electronics Cooling System (MECS).
Release the pressure in the engine cooling system and MECS by slowly turning the pressure relief caps one-half turn counterclockwise. When the
pressure is released, remove the pressure relief caps.
2. Using hose clamp pliers, clamp the engine coolant return hose and the MECS coolant return hose.
3. Using a suitable suction device, siphon the coolant from both sides of the degas bottle.
4. Disconnect the MECS coolant vent hose.
5. Disconnect the 2 engine coolant vent hoses.
6. Detach the pin-type retainer from the degas bottle.
7. Remove the degas bottle bolt and nut.
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To install, tighten the nut to 6 Nm (53 lb-in) and the bolt to 8 Nm (71 lb-in).
8. Lift the degas bottle up and disconnect the engine coolant and MECS coolant return hoses.
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Remove the degas bottle.
