Welcome to the cg-tower.com in-depth page on WJ Generation Jeep cool Cherokee cooling system service. We have organized together much information as we can find into a helpful write-up below. Is something incorrect or missing? Please call us and we’ll solve it!

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1999 Jeep grand Cherokee 4.7L V-8 Engine. J-912

Thermostats

Both the 4.0L and 4.7L engines usage 195° thermostats for all version years indigenous 1999-2004. When replacing a thermostat it is an extremely important to install one with the very same temperature rating (the just exception could be with particular performance modifications or chips the recommend or require a different temperature thermostat). No benefits or power gains deserve to be realized by installation a “cooler” thermostat into a stock engine. Doing therefore is not recommended, the will provide you chillier heat in the winter and also may interfere v engine performance.

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A thermostat rated reduced than the manufacturing facility thermostat will certainly richen your fuel mixture a bit at the expense of gas mileage, increased exhaust emissions and also dirtying her oil much faster – not to mention shortening the life of your cylinder walls and also catalytic converters and more frequent spark plug changes. The unnoticeable power gain, if any kind of at all, is merely not precious the potential drawbacks.

Radiator hose clamps

The cooling system utilizes both worm drive and also spring kind hose clamps. If a spring type clamp instead of is necessary, replace with the original Mopar devices spring form clamp.

CAUTION: A number or letter is stamped right into the tongue of consistent tension clamps. If instead of is necessary, use only a original devices clamp with equivalent number or letter. See image below.

The worm form hose clamp offers a mentioned torque value to maintain ideal tension on a hose connection. The spring type hose clamp applies continuous tension ~ above a water tap connection.

WARNING: continuous TENSION water tap CLAMPS ARE used ON most COOLING mechanism HOSES. As soon as REMOVING OR INSTALLING, USE just TOOLS DESIGNED because that SERVICING THIS kind OF CLAMP, together AS unique CLAMP device MILLER p/n 8495A. SNAP-ON CLAMP device p/n HCP20 may BE offered FOR bigger CLAMPS. Always WEAR security GLASSES when SERVICING consistent TENSION CLAMPS. A NUMBER OR LETTER IS STAMPED right into THE TONGUE OF constant TENSION CLAMPS. IF instead of IS NECESSARY, USE only AN ORIGINAL tools CLAMP WITH corresponding NUMBER OR LETTER.

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Radiator hose consistent tension clamp – size location

4.0L engine – Draining the cooling system

WARNING: carry out NOT eliminate THE CYLINDER BLOCK drain PLUGS OR loosen THE RADIATOR DRAINCOCK WITH system HOT and also UNDER PRESSURE. Serious BURNS from COOLANT have the right to OCCUR.

1. Execute NOT remove radiator lid first. With engine cold, situate radiator draincock ~ above the right reduced side of radiator encountering to rear of vehicle.

2. Attach one end of a water tap to the draincock. Placed the other finish into a clean container. Open up draincock and also drain coolant native radiator. This will empty the coolant reserve/overflow tank. The coolant go not have to be gotten rid of from the tank uneven the mechanism is being refilled v a fresh mixture. When tank is empty, eliminate radiator cap and also continue draining cooling system. To drainpipe the engine block of coolant, remove the cylinder block drain plug, situated on the side of cylinder block listed below the exhaust manifold.

4.0L engine – refilling the cooling system

Coolant recommendations and cautions:

The encourage mixture is 50/50 ethylene-glycol and also low mineral contents water. Never ever use pure antifreeze. Just Mopar Antifreeze Coolant, 5 Year/100,000 Mile Formula (glycol basic coolant with corrosion inhibitors called HOAT) is recommended. This coolant uses the ideal engine cooling without corrosion when mixed with 50% distilled water.

Antifreeze mixture must constantly be at least 44%, every climates year round. Maximum defense (-90d) is listed with a 68% mixture protection. If the percent is lower than 44 percent, engine parts might be eroded by cavitation, and also cooling system materials may it is in severely damaged through corrosion.

CAUTION: Mopar Antifreeze/Coolant, 5 Year/100,000 Mile Formula (MS-9769) may not be mixed with any other form of antifreeze. Mixing of coolants various other than specified (non-HOAT or various other HOAT), may result in engine damage that may not be extended under the brand-new vehicle warranty, and also decreased corrosion protection.

CAUTION: carry out not use coolant additives the are asserted to enhance engine cooling.

4.0L coolant capacity:

1999-2000: 13.0 qts. (including 2.3 qts. For resevoir)2001-2004: 15.0 qts. (including 1 qt. For resevoir)

1. Tighten the radiator draincock and also the cylinder block drain plug(s) (if removed).

2. Fill system using a 50/50 mixture the ethyleneglycol antifreeze and also low mineral content water. Fill radiator come top and install radiator cap. Include sufficient coolant to the reserve/overflow tank come raise level to full mark.

3. Through heater control unit in the heat position, operate engine through radiator cap in place.

4. After engine has reached normal operating temperature, closeup of the door engine off and allow it come cool. As soon as engine is cooling down, coolant will be attracted into the radiator from the reserve/overflow tank.

5. Add coolant to reserve/overflow tank together necessary. Only add coolant to the reserve/overflow tank when the engine is cold. Coolant level in a heat engine will be greater due to thermal expansion. To purge the cooling system of every air, this heat up/cool down cycle (adding coolant to cold engine) need to be performed three times. Include necessary coolant to raise tank level come the complete mark after each cool under period.

4.0L engine – including additional coolant

The usage of aluminum cylinder blocks, cylinder heads and also water pumps requires special corrosion protection. Just Mopart Antifreeze/Coolant, 5 Year/100,000 Mile Formula (glycol base coolant v corrosion inhibitors referred to as HOAT, for Hybrid necessary Additive Technology) is recommended. This coolant uses the finest engine cooling without corrosion when mixed with 50% distilled water to obtain to acquire a freeze suggest of -35°F (-37°C). If it loses color or becomes contaminated, drain, flush, and replace with fresh properly combined coolant solution.

CAUTION: execute not usage coolant additives that are declared to boost engine cooling.

4.7L engine – Draining the cooling system

WARNING: execute NOT eliminate THE CYLINDER BLOCK drain PLUGS OR loosen THE RADIATOR DRAINCOCK WITH device HOT and UNDER PRESSURE. Serious BURNS indigenous COOLANT have the right to OCCUR.

1. Carry out NOT eliminate radiator cap first. Through engine cold, find radiator draincock ~ above the left lower side that radiator facing to behind of vehicle.

2. Affix one end of a water tap to the draincock. Put the other finish into a clean container. Open up draincock and drain coolant indigenous radiator. This will empty the coolant reserve/overflow tank. The coolant walk not need to be eliminated from the tank unless the device is gift refilled v a fresh mixture. When tank is empty, eliminate radiator cap and also continue draining cooling system. To drainpipe the engine block of coolant, remove the cylinder block drain plug, situated on the next of cylinder block listed below the exhaust manifold.

4.7L engine – refilling the cooling system and adding additional coolant

Coolant recommendations and cautions:

The recommended mixture is 50/50 ethylene-glycol and low mineral content water. Never ever use pure antifreeze. Just Mopar Antifreeze Coolant, 5 Year/100,000 Mile Formula (glycol basic coolant with corrosion inhibitors dubbed HOAT) is recommended. This coolant offers the ideal engine cooling without corrosion when combined with 50% distilled water.

Antifreeze mixture must constantly be at least 44%, all climates year round. Maximum protection (-90d) is detailed with a 68% mixture protection. If the percentage is reduced than 44 percent, engine parts may be eroded by cavitation, and cooling system components may it is in severely damaged by corrosion.

CAUTION: Mopar Antifreeze/Coolant, 5 Year/100,000 Mile Formula (MS-9769) may not be blended with any type of other kind of antifreeze. Mix of coolants other than specified (non-HOAT or other HOAT), may an outcome in engine damage that may not be spanned under the brand-new vehicle warranty, and also decreased corrosion protection.

CAUTION: perform not usage coolant additives that are declared to enhance engine cooling.

4.7L coolant capacity:

1999-2000: 13.0 qts. (including 2.3 qts. For resevoir)2001-2004: 14.5 qts. (including 1 qt. For resevoir)

1. Tighten the radiator draincock and the cylinder block drainpipe plug(s) (if removed).

CAUTION: fail to purge wait from the cooling system can result in one overheating condition and severe engine damage.

2. Remove the cooling device bleed plug native the radiator upper hose inlet real estate (see photo listed below for plug location). Fill system using a 50/50 mixture that ethylene-glycol antifreeze and also low mineral content water, till coolant begains coming out of the cooling system bleed hole. Download the cooling mechanism bleed plug. To fill radiator come top and also install radiator cap. Include sufficient coolant come the reserve/overflow tank to raise level to complete mark.

3. V heater control unit in the heat position, operate engine v radiator cap in place.

4. After engine has reached common operating temperature, shut engine turn off and enable it come cool. As soon as engine is cooling down, coolant will be drawn into the radiator native the reserve/overflow tank.

5. Include coolant to reserve/overflow tank as necessary. Only add coolant come the reserve/overflow tank when the engine is cold. Coolant level in a warm engine will be higher due to heat expansion. To purge the cooling device of all air, this warmth up/cool under cycle (adding coolant to cold engine) have to be performed three times. Add necessary coolant come raise tank level to the full mark after every cool under period.

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Cooling mechanism bleed plug – 4.7L engines only

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Thermostat location – 4.7L engine

4.0L and 4.7L – Cooling device reverse flushing

CAUTION: The cooling system normally operates in ~ 14 come 18 psi (97 come 124 kPa) pressure. Exceeding this pressure may damage the radiator or hoses.

Reverse flushing that the cooling system is the forcing the water with the cooling system. This is done using air pressure in the opposite direction of regular coolant flow. That is typically only crucial with an extremely dirty solution with evidence of partial plugging.

Chemical cleaning

If visual inspection suggests the formation of sludge or scaly deposits, usage a radiator cleaner (Mopar Radiator Kleen or equivalent) before flushing. This will certainly soften scale and also other shop and help the flushing operation.

CAUTION: Be sure instructions on the container are followed

Reverse flushing the radiator

Disconnect the radiator hoses indigenous the radiator fittings. Affix a ar of radiator water tap to the radiator bottom outlet fitting and also insert the flushing gun. Affix a water supply hose and air supply hose to the flushing gun.

CAUTION: The cooling system usually operates at 14 come 18 psi (97-to-124 kPa) pressure. Exceeding this push may damage the radiator or hoses.

Allow the radiator come fill with water. Once radiator is filled, apply air in quick blasts allowing radiator come refill between blasts. Proceed this reverse flushing till clean water flows out v rear of radiator cooling tube passages. For more information, refer to operating instructions gave with flushing equipment. Have radiator cleaned an ext extensively by a radiator repair shop.

Reverse flushing the engine

Drain the cooling system (as defined above). Remove the thermostat housing and thermostat. Install the thermostat housing. Disconnect the radiator top hose indigenous the radiator and also attach the flushing gun to the hose. Disconnect the radiator lower hose from the water pump. Attach a lead far hose to the water pump inlet fitting.

CAUTION: Be certain that the heater control valve is closed (heat off). This is done to stop coolant flow with scale and other deposits native entering the heater core.

Connect the water supply hose and also air supply water tap to the flushing gun. Enable the engine come fill through water. As soon as the engine is filled, apply air in brief blasts, enabling the system to fill in between air blasts. Continue until clean water flows with the lead away hose. For much more information, refer to operating instructions supplied with flushing equipment.

Remove the lead away hose, flushing gun, water supply hose and also air it is provided hose. Remove the thermostat housing. Install the thermostat and also housing through a instead of gasket. Affix the radiator hoses. Refill the cooling system with the exactly antifreeze/water mixture as explained above.

4.0L engine – Thermostat removal

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WARNING: carry out NOT loosen THE RADIATOR DRAINCOCK through THE system HOT and also PRESSURIZED. Major BURNS from THE COOLANT can OCCUR.

1. Drainpipe the coolant native the radiator till the level is below the thermostat housing. Do not waste reusable coolant. If the equipment is clean, drainpipe the coolant right into a clean container because that reuse.

2. Eliminate radiator upper hose and heater hose at thermostat housing. See cautions over for removing radiator hose clamps.

3. Disconnect wiring connector at engine coolant temperature sensor.

4. Eliminate thermostat real estate mounting bolts, thermostat housing, gasket and also thermostat. Discard old gasket.

5. Clean the gasket adjustment surfaces.

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WARNING: consistent TENSION water tap CLAMPS ARE supplied ON many COOLING mechanism HOSES. As soon as REMOVING OR INSTALLING, USE just TOOLS DESIGNED for SERVICING THIS kind OF CLAMP, together AS distinct CLAMP device MILLER p/n 8495A. SNAP-ON CLAMP tool p/n HCP20 might BE provided FOR bigger CLAMPS. Always WEAR safety GLASSES when SERVICING consistent TENSION CLAMPS. A NUMBER OR LETTER IS STAMPED right into THE TONGUE OF consistent TENSION CLAMPS. IF instead of IS NECESSARY, USE just AN ORIGINAL equipment CLAMP WITH matching NUMBER OR LETTER.

4.0L engine – Thermostat installation

1. Install the replacement thermostat so that the pellet, i beg your pardon is encircled by a coil spring, encounters the engine. Every thermostats are marked on the external flange to suggest the ideal installed position.(a) observe the recess groove in the engine cylinder head.(b) position thermostat in groove with arrow and air bleed feet on outer flange pointing up.

2. Download replacement gasket and thermostat housing.

CAUTION: Tightening the thermostat housing unevenly or v the thermostat out of that is recess, may result in a cracked housing.

3. Tighten the real estate bolts to 16 ft. Lbs. (22 N·m) torque.

4. Install hoses come thermostat housing.

5. Install electric connector to coolant temperature sensor.

6. Be certain that the radiator draincock is tightly closed. Fill the cooling system to the correct level through the required coolant mixture. Check out refill direction above.

7. Start and warm the engine. Inspect for leaks.

4.7L engine – Thermostat removal

WARNING: execute NOT loosen RADIATOR DRAINCOCK WITH system HOT and also PRESSURIZED. Serious BURNS indigenous COOLANT have the right to OCCUR.

1. Disconnect an unfavorable battery cable at battery.

2. Drainpipe cooling system. Carry out not waste recycle coolant. If solution is clean, drainpipe coolant right into a clean container because that reuse. If thermostat is gift replaced, be sure that replacement is stated thermostat for automobile model and engine type.

3. Eliminate splash shield.

4. Remove reduced radiator water tap clamp and also lower radiator water tap at thermostat housing. View cautions over for remove radiator water tap clamps.

5. Eliminate thermostat housing mounting bolts, thermostat housing and thermostat.

4.7L engine – Thermostat installation

1. Clean mating locations of timing chain cover and thermostat housing.

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

3. Position thermostat housing on time chain cover.

4. Install 2 housing-to-timing chain covering bolts. Tighten bolts come 115 in. Lbs. (13 N·m) torque.

CAUTION: housing must it is in tightened evenly and thermostat need to be focused into recessed groove in timimg chain cover. If not, it may result in a cracked housing, damaged time chain sheathe threads or coolant leaks.

5. Install lower radiator hose on thermostat housing.

6. Download splash shield.

7. Be certain that the radiator draincock is tightly closed. To fill cooling system. View refill direction above.

8. Connect an adverse battery cable come battery.

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9. Start and warm the engine. Examine for leaks.

WJ Thermostat components 1999-2004

4.0LThermostatGasket

Housing

52028186AB53020547AB

53006192

$6.20$2.10

$13.70

4.7LThermostat & gasketHousing52079476AB53020887AB$26.60$14.50
(Prices detailed are because that reference objectives only and may differ by dealer. Parts are not accessible from this net site.)