Thermostat- 4.7L engine. Radiator

Thermostat- 4.7L engine

REMOVAL

WARNING: DO NOT LOOSEN RADIATOR DRAINCOCK WITH SYSTEM HOT AND PRESSURIZED.

SERIOUS BURNS FROM COOLANT CAN OCCUR.

Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse.

If thermostat is being replaced, be sure that replacement is specified thermostat for vehicle model and engine type.

(1) Disconnect negative battery cable at battery.

(2) Drain cooling system. Refer to Draining Cooling System in this section.

Fig. 48 Belt Routing-5.2L/5.9L Engines

1 - IDLER PULLEY

2 - GENERATOR PULLEY

3 - A/C COMPRESSOR PULLEY

4 - IF W/OUT A/C

5 - POWER STEERING PUMP PULLEY

6 - WATER PUMP PULLEY

7 - CRANKSHAFT PULLEY

8 - AUTOMATIC TENSIONER

(3) Raise vehicle on hoist.

(4) Remove splash shield.

(5) Remove lower radiator hose clamp and lower radiator hose at thermostat housing.

(6) Remove thermostat housing mounting bolts, thermostat housing and thermostat (Fig. 49).

INSTALLATION

(1) Clean mating areas of timing chain cover and thermostat housing.

(2) Install thermostat (spring side down) into recessed machined groove on timing chain cover (Fig.

49).

(3) Position thermostat housing on timing chain cover.

(4) Install two housing-to-timing chain cover bolts.

Tighten bolts to 13 N*m (115 in. lbs.) torque.

CAUTION: Housing must be tightened evenly and thermostat must be centered into recessed groove in timimg chain cover. If not, it may result in a cracked housing, damaged timing chain cover threads or coolant leaks.

Fig. 49 Thermostat and Thermostat Housing 4.7L

1 - THERMOSTAT HOUSING

2 - THERMOSTAT LOCATION

3 - THERMOSTAT AND GASKET

4 - TIMING CHAIN COVER

(5) Install lower radiator hose on thermostat housing.

(6) Install splash shield.

(7) Lower vehicle.

(8) Fill cooling system. Refer to Refilling Cooling System in this section.

(9) Connect negative battery cable to battery.

(10) Start and warm the engine. Check for leaks.

Radiator

REMOVAL

WARNING: DO NOT REMOVE CYLINDER BLOCK DRAIN PLUGS OR LOOSEN RADIATOR DRAINCOCK WITH SYSTEM HOT AND UNDER PRESSURE.

SERIOUS BURNS FROM COOLANT CAN OCCUR.

(1) Disconnect battery negative cable.

(2) Drain cooling system. Refer to Draining and Filling Cooling System in this section.

WARNING: CONSTANT TENSION HOSE CLAMPS ARE USED ON MOST COOLING SYSTEM HOSES.

WHEN REMOVING OR INSTALLING, USE ONLY TOOLS DESIGNED FOR SERVICING THIS TYPE OF CLAMP, SUCH AS SPECIAL CLAMP TOOL (NUMBER 6094) (Fig. 50). SNAP-ON CLAMP TOOL (NUMBER HPC-20) MAY BE USED FOR LARGER CLAMPS.

ALWAYS WEAR SAFETY GLASSES WHEN SERVICING CONSTANT TENSION CLAMPS.

CAUTION: A number or letter is stamped into the tongue of constant tension clamps (Fig. 51). If replacement is necessary, use only an original equipment clamp with matching number or letter.

Fig. 50 Hose Clamp Tool-Typical

1 - HOSE CLAMP TOOL 6094

2 - HOSE CLAMP

Fig. 51 Clamp Number/Letter Location

1 - CONSTANT TENSION HOSE CLAMP

2 - CLAMP NUMBER/LETTER LOCATION

3 - HOSE

(3) Remove hose clamps (Fig. 50) and hoses from radiator. Disconnect coolant reserve/overflow tank hose and washer bottle electrical connector and hose.

(4) Remove upper fan shroud mounting screws Lift upper fan shroud assembly up and out of engine compartment (Fig. 52).

(5) Remove front grille. Refer to BODY for procedure.

(6) Disconnect transmission oil cooler lines, (if equipped) (Fig. 53).

(7) Disconnect electric cooling fan motor connector.

(8) Remove radiator upper mounting screws (Fig.

54). Lift radiator upward and away from vehicle. Do not allow cooling fins of radiator to contact any other vehicle component. Radiator fin damage could result.

INSTALLATION

The radiator has two isolator pins on bottom of both tanks. These fit into alignment holes in radiator lower support (Fig. 54).

(1) Position isolator pins into alignment holes in radiator lower support.

(2) Install and tighten radiator mounting bolts to 23 N*m (200 in. lbs.) (Fig. 54).

(3) Install the transmission oil cooler lines, (if equipped).

(4) Install front grille.

(5) Connect fan motor electrical connector to harness connector.

(6) Position upper fan shroud onto lower fan shroud and radiator.

(7) Install retaining screws into shroud.

(8) Install radiator hoses. reconnect coolant reserve/overflow tank hose.

(9) Connect battery negative cable.

Fig. 52 Radiator Upper Fan Shroud Removal/ Installation-Typical

1 - RADIATOR

2 - ELECTRIC COOLING FAN

3 - UPPER SHROUD AND OVERFLOW BOTTLE

4 - SCREW

5 - LOWER SHROUD

Fig. 53 Transmission Oil Cooler Lines-Automatic Transmission Only

1 - TRANSMISSION COOLER SUPPLY LINE

2 - TRANSMISSION OIL COOLER RETURN LINE

(10) Fill cooling system. Refer to Draining and Filling Cooling System in this section.

(11) Start and warm the engine. Check for leaks.

Fig. 54 Radiator Removal/Installation-Typical

1 - CORE SUPPORT

2 - LOWER ISOLATOR MOUNTS

3 - ISOLATOR PINS

4 - RADIATOR ASSEMBLY

5 - SCREWS