What could be cause of noise coming from lower front?

1. Disconnect the negative battery cable.
2. Partially drain the cooling fan.
3. Raise and support the vehicle. Refer to Vehicle Lifting.
4. Remove the transmission oil cooler lines from the retainers at the bottom of the cooling fan shroud.
5. Remove the lower fan shroud push pin retainers.
6. Lower the vehicle.
7. Remove the right and the left engine mount struts.
8. Remove the left front fender upper diagonal brace.
9. Remove the radiator inlet hose from the radiator.
10. Remove the air cleaner assembly.
11. If equipped remove the cooling fan heat shields.
12. Disconnect the cooling fan shroud electrical connectors.
13. Remove the cooling fan shroud bolts.
14. Disengage the cooling fan shroud clip from the top of the radiator.
15. Remove the cooling fan shroud.

Hello, yes once you remove the outer housing it should not be difficult to snap or fasten into place.

1. Drain the cooling system.
   
2. Unfasten the upper fan shroud bolts and remove the upper fan shroud.
   
3. If equipped, remove the upper panel fasteners and the panel.
   
4. If equipped, remove the upper insulators and brackets.
   
5. Disconnect the radiator upper and lower hoses and, if applicable, the transmission coolant lines.
   
6. Remove the coolant recovery system line, if so equipped.
   
7. Remove the oil coolant lines, if equipped.
   
8. Remove the lower fan shroud bolts and the lower fan shroud.
   
9. Remove radiator from the lower brackets and insulators.
   

10. To install:
    

    1. Install the radiator on the lower brackets and insulators.
       
    2. Install the lower fan shroud and its retaining bolts. Tighten the shroud bolts to 71 inch lbs. (9 Nm).
       
    3. Attach and tighten the engine oil cooler pipe bolts to 18 ft. lbs. (24 Nm) and the transmission oil cooler bolts to 19 ft. lbs. (26 Nm).
       
    4. Attach the lower and upper radiator hoses..
       
    5. Install the upper insulators, the upper fan shroud and fan shroud bolts. Tighten the shroud bolts to 71 inch lbs. (9 Nm).
       
    6. Attach the coolant recovery system line, if so equipped.
       
    7. If equipped, install the upper panel fasteners.
       
    8. Refill the cooling system.
       

Radiator Aluminum Core, Crossflow — 3.8L (Base) and 4.6L Engines
Removal

1. Drain engine cooling system as described. Disconnect upper radiator hose (8260) and lower radiator hose (8286) and radiator overflow hose (8075) from the radiator (8005). Disconnect the transmission oil cooler inlet and outlet lines from the radiator.
   

1. Remove cooling fan motor,fan blade (8600) and fan shroud (8146) assembly as described.
   

1. Remove radiator upper bracket retaining bolts and remove bracket. Lift radiator from vehicle.
   

Installation

1. Position the radiator into the vehicle. Install upper brackets and tighten bolts securely.
   

1. Connect the transmission oil cooler lines to the transmission oil cooler fittings.
   

1. Install cooling fan motor, fan blade and fan shroud assembly as described.
   

Engine Cooling Fan Motor, Fan Blade and Fan Shroud Assembly, Electrical Removal

1. Disconnect (pull apart) the male-female cooling fan motor wiring connector at the side of the fan shroud (8146). Remove the male terminal connector retaining clip from the fan shroud mounting tab.
   

1. Remove two fan shroud upper retaining bolts at the radiator tanks.
   

1. Lift cooling fan motor/fan blade (8600)/fan shroud assembly past radiator (8005), disengaging fan shroud from two lower retaining clips.
   

Installation

1. Follow removal procedure in reverse order.
   

1. Tighten fan shroud retaining bolts to 5.2-7.2 Nm (46-63 lb-in).
   
   

HOPE THIS HELPS.

you need to find it, you are right ,something is rubbing. the fan wont come on with the a/c off until its pretty hot. 225f or so I think.

The fan is rubbing against the fan shroud. it may be misaligned or, the shroud has become loose. try aligning the shroud or making sure that it is screwed on correctly. The shroud mounting screws can become loose. This will allow the fan to rub against the shroud. this will create a loud noise. If during the inspection of the shroud you find that the fan is not rubbing against the shroud, this will confirm an issue that concerns the integrity of the electric motor sator assembly. the windings are bad. have the motor replaced if this is the case.

YOU NEED TO TAKE IT OUT FROM THE BOTTOM REMOVE PLASTIC SHROUD THEN DRIAN AND PULL LOWER RADIATOR HOSE FROM RADIATOR AND THE REST IS PRETTY SELF EXPLANATORY MAKE SURE YOU BUY THE CLIPS FOR THE WIRRING BEFORE YOU EVEN START

It looks like this unit is discontinued.

You can get an approximate idea of the cu. ft. by measuring the inside dimensions (h x w x depth) in inches, multiply them together, and divide by 1728.

As for the noise, it could be the condensor fan rubbing on the fan shroud (if the noise is outside of the box) the evaporator fan rubbing the fan shroud inside the box, or any number of other things.

WATER PUMP
The water pump is bolted directly to the engine timing chain case/cover.

A gasket is used as a seal between the water pump and timing chain case/cover.

If water pump is replaced because of bearing/shaft damage, or leaking shaft seal, the mechanical cooling fan assembly should also be inspected. Inspect for fatigue cracks, loose blades, or loose rivets that could have resulted from excessive vibration. Replace fan if any of these conditions are found. Also check condition of the thermal viscous fan drive. Refer to Viscous Fan Drive in this group.

The water pump can be removed without discharging the air conditioning system (if equipped)

REMOVAL
Disconnect negative battery cable from battery.
Drain cooling system. Refer to Draining Cooling System in this group.
Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse.

The thermal viscous fan drive is attached (threaded) to the water pump hub shaft. Remove fan/viscous fan drive assembly from water pump by turning mounting nut counterclockwise as viewed from front. Threads on viscous fan drive are RIGHT HAND. Using special tool spanner wrench 6958 with adapter pins 8346 and a suitable fan wrench loosen the fan drive Viscous Fan and Fan Drive Do not attempt to remove fan/viscous fan drive assembly from vehicle at this time.
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) 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. If replacement is necessary, use only an original equipment clamp with matching number or letter.

If water pump is being replaced, do not unbolt fan blade assembly from thermal viscous fan drive.
Remove two fan shroud-to-radiator nuts Fan Shroud Mounting Hardware Do not attempt to remove fan shroud at this time.
Remove fan shroud and fan blade/viscous fan drive assembly from vehicle as a complete unit.
After removing fan blade/viscous fan drive assembly, do not place thermal viscous fan drive in horizontal position. If stored horizontally, silicone fluid in viscous fan drive could drain into its bearing assembly and contaminate lubricant.
Remove accessory drive belt as follows: The drive belt is equipped with a spring loaded automatic belt tensioner. Relax tension from belt by rotating tensioner clockwise (as viewed from front) Automatic Belt Tensioner - When all belt tension has been relaxed, remove accessory drive belt.
Remove lower radiator hose clamp and remove lower hose at water pump.
Remove seven water pump mounting bolts and one stud bolt
CAUTION: Do not pry water pump at timing chain case/cover. The machined surfaces may be damaged resulting in leaks.

Remove water pump and gasket. Discard gasket.
INSTALLATION
Clean gasket mating surfaces.
Using a new gasket, position water pump and install mounting bolts as shown. Water Pump Installation - Tighten water pump mounting bolts to 54 N·m (40 ft. lbs.) torque.
Spin water pump to be sure that pump impeller does not rub against timing chain case/cover.
Connect radiator lower hose to water pump.
Relax tension from belt tensioner Automatic Belt Tensioner - Install drive belt
CAUTION: When installing the serpentine accessory drive belt, belt must be routed correctly. If not, engine may overheat due to water pump rotating in wrong direction. Refer to Belt Routing for correct belt routing. Or, refer to the Belt Routing Label located in the engine compartment. The correct belt with correct length must be used.

Position fan shroud and fan blade/viscous fan drive assembly to vehicle as a complete unit.
Be sure the upper and lower portions of the fan shroud are firmly connected. All air must flow through the radiator.
Install two fan shroud-to-radiator nuts Fan Shroud Mounting Hardware
Be sure of at least 25 mm (1.0 inches) between tips of fan blades and fan shroud.
Install fan blade/viscous fan drive assembly to water pump shaft.
Fill cooling system. Refer to Refilling the Cooling System in this group.
Connect negative battery cable.
Start and warm the engine. Check for leaks

SOMETIMES THE WIRING HARNESS GET DAMAGED WHEN FAN REMOVED. GM HAS BULLETIN TO REPLACE COOLING FAN WIRING HARNESS PART# 89024920
Harness Assembly, Engine Cooling Fan Wiring

1. Place the cooling fan assembly on a bench.
2. Disconnect the harness electrical connector from the cooling fan clutch.
3. Remove the harness from the plastic guide while feeding the wires out of the slot.
4. Before installing the new harness, wrap the affected area on the wires with electrical tape to keep the protective sleeve in place. Be sure to keep the tape approximately 25 mm (1 in) away from the connector so the wires can be fed into the slot.
5. Feed the wires into the slot and install the harness to the plastic guide.
6. Connect the harness electrical connector to the cooling fan clutch.
7. Install the cooling fan. Refer to the Cooling Fan and Shroud Replacement procedure in the Engine Cooling sub-section of SI.