DRAINING
When servicing the cooling system, it is essential that coolant does not drip onto the accessory drive belts and/or pulleys. Shield the belts with shop towels before working on the cooling system. If coolant contacts the belts or pulleys, flush both with clean water.
| WARNING | Make sure engine cooling system is cool before servicing. Do not remove any clamps or hoses , pressure cap, or open the radiator draincock. When the system is hot and under pressure serious burns from coolant can occur. |
- Position a clean collecting container under draincock location.
- Open radiator draincock located at the lower right side of radiator. Turn draincock counterclockwise until it stops.
- Remove coolant pressure cap.
- Raise vehicle on hoist.
- 2.7L/3.5L: Remove heater hose at heater tube located at the right front inner frame rail and direct coolant flow into container.
REVERSE FLUSHING RADIATOR
Disconnect the radiator hoses from the radiator inlet and outlet. Attach a section of the radiator hose to the radiator bottom outlet fitting and insert the flushing gun. Connect a water supply hose and air supply hose to the flushing gun.
| CAUTION | Internal radiator pressure must not exceed 138 kPa (20 psi) as damage to radiator may result. |
Allow the radiator to fill with water. When the radiator is filled, apply air in short blasts. Allow the radiator to refill between blasts. Continue this reverse flushing until clean water flows out through the rear of the radiator cooling tube passages.
REVERSE FLUSHING SYSTEM
Drain the cooling system. Remove the thermostat housing and thermostat. Install the thermostat housing. Disconnect the radiator upper hose from the radiator and attach the flushing gun to the hose. Disconnect the radiator lower hose from the water pump and attach a lead-away hose to the water pump inlet fitting.
Connect the water supply hose and air supply hose to flushing gun. Allow the engine to fill with water. When the engine is filled, apply air in short blasts, allowing the system to fill between air blasts. Continue until clean water flows through the lead away hose.
Remove the lead away hose, flushing gun, water supply hose and air supply hose. Remove the thermostat housing and install the thermostat. Install the thermostat housing with a replacement gasket. Refer to THERMOSTAT for replacement. Connect the radiator hoses. Refill the cooling system with the correct antifreeze/water mixture. Refer to Vehicle Quick Reference/Capacities and Recommended Fluids - Description . Refer to FILLING .
DRAINCOCK
- Align draincock (2) stem to radiator tank (1) opening.
- Push draincock (2) into the radiator tank (1) opening.
- Tighten the draincock (2) by turning clockwise until it stops.
- Fill the cooling system. See «Standard Procedure»(ref-353584-S11330501202010011200000) .
- Install belly pan (if equipped).