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REVERSE FLUSHING ENGINE Jeep Grand Cherokee WK

Engine Cooling System & Automatic Transmission Cooling System 2 illustrations ~403 words

REVERSE FLUSHING ENGINE

Drain the cooling system. See STANDARD PROCEDURE . 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. Attach a lead away hose to the water pump inlet fitting.

CAUTIONBe sure that the heater control valve is closed (heat off). This is done to prevent coolant flow with scale and other deposits from entering the heater core.

Connect the water supply hose and air supply hose to the 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. For more information, refer to operating instructions supplied with flushing equipment.

Remove the lead away hose, flushing gun, water supply hose and air supply hose. Remove the thermostat housing. See REMOVAL . Install the thermostat and housing with a replacement gasket. See INSTALLATION . Connect the radiator hoses. Refill the cooling system with the correct antifreeze/water mixture. See STANDARD PROCEDURE .

Scheme 6

Scheme 6: SYSTEM REFILLING-DIESEL ENGINE
Scheme 6: SYSTEM REFILLING-DIESEL ENGINE
1 - Hose clips

Scheme 7

Scheme 7
Scheme 7
  1. Tighten the radiator draincock and the cylinder block drain plug(s) (if removed).
  2. Remove thermostat housing bleed hose from two clips. 1 - Bleed hose
  3. Hold the thermostat housing bleed hose up so that air can flow up to bottle. CAUTION: Failure to purge air from the cooling system can result in an overheating condition and severe engine damage.
  4. Fill cooling system with the antifreeze mixture. Refer to «DESCRIPTION»(/jeep/grand-cherokee/wk-2004-2010/remont/hoistjack/#lubrication-maintenance) . Fill pressure bottle to service line and install cap. NOTE: The engine cooling system will push any remaining air into the coolant bottle within about an hour of normal driving. As a result, a drop in coolant level in the pressure bottle may occur. If the engine cooling system overheats and pushes coolant into the overflow side of the coolant bottle, this coolant will be sucked back into the cooling system ONLY IF THE PRESSURE CAP IS LEFT ON THE BOTTLE. Removing the pressure cap breaks the vacuum path between the two bottle sections and the coolant will not return to cooling system.
  5. With heater control unit in the HEAT position, operate engine with pressure bottle cap in place.
  6. Add coolant to pressure bottle as necessary. Only add coolant to the pressure bottle when the engine is cold. Coolant level in a warm engine will be higher due to thermal expansion.
  7. Reinstall the thermostat housing bleed hose in the two clips.