Hello, has anybody adapted an extra fan to the radiator cooling system. If so, could you give me some information as type of fan, where to install it. motor temperature has always been a problem with

5.7L Engines

1. Before servicing the vehicle, refer to the Precautions section.
2. Disconnect negative battery cable.
3. Drain the cooling system.
4. Disconnect negative battery cable.
5. Remove the upper radiator hose.
6. Disconnect cooling fan electrical connector.
7. Remove cooling fan mounting bolts.
8. Remove the radiator cooling fan assembly from vehicle.
9. Remove the radiator fan assembly.
10. Remove accessory drive belt.
11. Remove thermostat.
    NOTE The water pump mounting bolts are different lengths. Note the location of the water pump mounting bolts.
    

To install:

1. Install water pump and mounting bolts. Tighten mounting bolts to 20 ft. lbs. (28 Nm).
2. Make sure double ended bolt is in the proper location. Tighten double ended bolt to 20 ft. lbs. (28 Nm).
3. Position the radiator cooling fan assembly in vehicle.
4. Install cooling fan mounting bolts. Tighten to 50 inch lbs. (6 Nm)
5. Connect the cooling fan electrical connector.
6. Install the upper radiator hose.
7. Install thermostat.
8. Install the accessory drive belt.
9. Install the radiator fan assembly.
10. Connect negative battery cable.
11. Fill the cooling system.
12. Pressure test cooling system.

flushing a cooling system is the same method as any other motor

do it without the thermostat fitted
or water pump opening

sacrifice an old radiator hose to adapt a garden hose fitting
for radiator flush

air in system fix
your thermostat housing has no air bleed valve
no top radiator cap

old school way
heater on full
run motor till thermostats fully open
burp radiator hoses
wait till water is running up into over flow bottle without bubble
replace cap
turn off heater
correct level in over flow bottle

why still over heating
you fitted everything i would have ... yet still overheat
possibles
leaking inlet manifold gaskets
hose clamps loose
cooling fans spinning too slow
thermostatic fan switch faulty
aluminum radiator is a big one
air ..fins bent or some water channels blocked

or possible head gasket leak

Here are 10 tips to address with any overheating problem:

1. Many cars overheat from more than one problem. Often we assume a bigger radiator or a similar big gun solution will fix our problem. Maybe it will, but often by so doing you are addressing the symptom and not the cause. Many cars over the years pick up little annoyances that contribute to overheating. Individually none of them would overheat your car. Collectively you have an overheating problem. Look at the whole car when addressing overheating problems.

2. Before you do anything else, tune up the car. Many overheating cars are out of tune, Be dead nuts certain you are not running lean or with retarded timing.
A lean fuel mixture will overheat your car right now. If your engine runs lean you can chase your tail looking for problems in the cooling system and never figure it out. Be sure you are not running lean. The easy way to do this is richen your jetting a couple of steps. If the overheating is better, you're on the right track.

3. There is a lot of misinformation about ignition timing and cooling. Retarded timing contributes to overheating. Advanced timing helps cooling. Bump up your initial timing a few degrees and see if it helps the car run cooler. It's an easy and practical fix. Of course, if you advance enough to enter pre-ignition or detonation you will start to overheat. Detonation contributes to overheating. If you start to detonate back off the timing. Overheating cars should always run vacuum advance. Vacuum advance helps cooling.

4. Cars can overheat from coolant circulation that is either too slow or too fast. When your car left the factory it probably had the correct speed for the water pump. Over the years things change, pulleys are swapped, rear end ratios are changed, tire sizes vary. Your car may not have the right circulation speed for the water pump. Remember cars can overheat from circulation that is either too fast or too slow.

5. Look at your airflow. Be sure your shroud fits properly and is sealed to the radiator. What'd ya mean you don't have a fan shroud??!!?? If not, obtain a shroud before you do anything else. You can adapt a shroud from the junkyard or many after market suppliers can provide you one. Seal the shroud to the radiator with weather stripping.

6. The best all around fan is the factory design with a thermal fan clutch. Flex fans aren't as versatile, Solid fans pull lots of air but are noisy and suck horsepower when you don't need the extra cooling.
If you need extra air flow there are many electric fans on the market that can help. Be sure your charging system is up to the task of handling the extras amps from an electric fan.

7. Reduce the antifreeze in your coolant. A 50/50 mixture does not help cooling. Either run 100% distilled water with water pump lubricant or distilled water with about 15-20 % antifreeze. Either mixture will cool better than 50/50 and still lubricate the water pump and provide corrosion protection for your system. Remember when the weather turns cool to switch back to 50/50.

8. Use a better grade of gas. If you are not running premium and you are overheating, step up to the top grade. If there is no improvement, try advancing your timing a few degrees. The extra octane will allow you a little extra timing without getting into detonation. Many older cars and particular muscle cars were designed for better gas (4 or 5 star, > 98 octane) than is now available. If you are detonating on today's gas you can be overheating. Remember not all detonation is audible.

9. If you are running an automatic, install a quality after market transmission cooler. Cooling the transmission is added work for an already overtaxed radiator. Do not mount the cooler in front of the radiator where it will overheat the cooling air. Rather mount it to one side.

10. Notice your driving habits. The more gas you burn the more heat the engine produces. Jackrabbit starts followed by hard braking, constant acceleration, flogging the engine uphill, all burn lots of gas. Yes, these are performance cars and that's why we love them. We're not saying don't enjoy your car, but if you are constantly into the accelerator, you are producing extra heat that the cooling system has to get rid of.

Compared to the expense of buying parts in a hit and miss fashion to solve your problem, investing in researching the origin of the issue is a downright good investment.

Arnoud Malherbe

(text based on information from varioussources on the internet)

Hello! The heater core is partially blocked...I would suggest flushing the cooling system with the temperature control on high...NOTE...The type of anti-freeze used in your vehicle is DexCool...If another type is used it may damage the cooling system...To flush...Drain radiator...Fill with plain water...Run engine until thermostat opens...Turn engine off...Let cool then drain...Do this at least three times or until water drains clear...Install new thermostat...Refill with 50/50 DexCool...Leave the radiator cap off as engine warms...Allow all air bubbles to escape...Then install cap...

The down side of DexCool is electrolysis...Electrical current flowing in the cooling system which can cause the anti-freeze to "clump" blocking its flow...Periodic flushing eliminates the problem...

Guru.........Saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

Check to see if the fan on the radiator is working at idle.

Here's information on how to change the fan if needed:

Engine Cooling Fan Removal & Installation 2.4L Engine To Remove:

1. Remove the coolant bottle and set aside.
2. Remove the power steering reservoir and set aside.
3. Disconnect the cooling fan connector.
4. Remove the cooling fan mounting screws and the cooling fan.

To Install:

1. Install the cooling fan and the mounting screws. Tighten to 50 in-lb (5.5 Nm).
2. Connect the cooling fan connector.
3. Install the power steering reservoir.
4. Install the coolant bottle.

3.7L Engine To Remove:
NOTE: If the fan blade is bent, warped, cracked or damaged in any way, it must be replaced ONLY with a replacement fan blade. DO NOT attempt to repair a damaged fan blade.
NOTE: For 3.7L Heavy Duty/Max Cool/Trailer Tow cooling package, the viscous fan cannot be removed separate from the shroud. Both fan and shroud must be removed together.

1. Disconnect battery negative cable.
2. Using special tool #6958 spanner wrench and #8346 adapters, remove the viscous fan from the water pump.
3. Gently lay fan into shroud.
4. Disconnect the electrical connector for the electric fan, then disconnect connector from shroud.
5. Remove the two fan shroud mounting bolts connecting the fan shroud to the radiator.
6. Remove the shroud and fan from the vehicle.

To Install:

1. Install fan shroud assembly into the vehicle. Tighten fan shroud to radiator bolts to 50 in-lb (5.5 Nm).
2. Install shroud mounting bolts tighten bolts to 89 in-lb (10 Nm).
3. Connect fan motor wire connector to harness connector, and attach connector to shroud.
4. Connect negative battery cable.
5. Start engine and check fan operation.

1988–91 Models

1. Disconnect the negative battery cable.
2. Properly drain the cooling system into a suitable container.
3. Disconnect the fan motor and motor connector.
4. Disconnect the upper and lower radiator hoses.
5. Disconnect and plug the automatic transaxle cooling lines at the radiator, if equipped.
6. Disconnect the coolant reservoir overflow hose.
7. Remove the radiator attaching bolts and brackets.
8. Remove the radiator with the cooling fan attached.
9. Remove the cooling fan and shroud from the radiator. NOTE: Check all cooling system hoses for any signs of damage, leaks or deterioration and replace if necessary. To install:
   
10. Attach the cooling fan and shroud to the radiator and install the assembly.
11. Attach the radiator bolts and brackets. Tighten the radiator bracket bolts to 7 ft. lbs. (10 Nm).
12. Connect the coolant reservoir overflow hose.
13. Connect the automatic transaxle cooling lines to the radiator, if equipped.
14. Connect the upper and lower radiator hoses.
15. Connect the fan motor and thermo-switch wire connector.
16. Refill the system with the proper type and quantity of coolant, check for leaks and bleed the cooling system.
17. Reconnect the negative battery cable. Fig. 7: Cooling system components — 1988–91 engines
    

1992–95 Models

1. Disconnect the negative battery cable.
2. Properly drain the cooling system into a suitable container.
3. Disconnect the fan motor and motor connector.
4. Disconnect the upper and lower radiator hoses.
5. Disconnect and plug the automatic transaxle cooling lines at the radiator, if equipped.
6. Disconnect the coolant reservoir overflow hose.
7. Remove the radiator attaching bolts and brackets.
8. Remove the radiator with the cooling fan attached.
9. Remove the cooling fan and shroud from the radiator. NOTE: Check all cooling system hoses for any signs of damage, leaks or deterioration and replace if necessary. To install:
   
10. Attach the cooling fan and shroud to the radiator and install the assembly.
11. Attach the radiator bolts and brackets. Tighten the radiator bracket bolts to 7 ft. lbs. (10 Nm).
12. Connect the coolant reservoir overflow hose.
13. Connect the automatic transaxle cooling lines to the radiator, if equipped.
14. Connect the upper and lower radiator hoses.
15. Connect the fan motor and thermo-switch wire connector.
16. Refill the system with the proper type and quantity of coolant, check for leaks and bleed the cooling system.
17. Reconnect the negative battery cable. Fig. 8: Cooling system components — 1992–95 engines
    

Removal & Installation To Remove:

1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
2. Remove or disconnect the following:
   • Radiator upper crossmember
   • Fan motor electrical connector
3. Drain cooling system below the level of the upper radiator hose.
4. Remove or disconnect the following:
   • Upper radiator hose from radiator
   • Radiator fan fasteners and upper clip
   • Fan assembly by lifting upward to clear radiator

To Install:

1. Install or connect the following:
   • Radiator fan assembly
   • Upper clip and fasteners
   • Upper radiator hose to radiator
   • Fan motor electrical connector
   • Radiator upper crossmember
2. Fill cooling system.

Electric Engine Fan - Fan Switch

Removal & Installation
2.7L Engine

1. Disconnect negative battery cable.
2. Partially drain cooling system.
3. Disconnect the electrical connector .
4. Remove engine coolant sensor from coolant outlet tube .
   

To install:

1. Apply thread sealant to sensor threads.
2. Install engine coolant temperature sensor into coolant outlet tube.
3. Tighten sensor to 20 ft. lbs.(28 Nm) torque.
4. Connect electrical connector to engine coolant temperature sensor .
   

3.2L And 3.5L Engines

1. Disconnect negative battery cable.
2. Partially drain cooling system.
3. With the engine cold, disconnect coolant sensor electrical connector.
4. Remove sensor.
   

To install:

1. Install engine coolant temperature sensor.
2. Tighten sensor to 20 ft. lbs.(28 Nm) torque.
3. Attach electrical connector to sensor.
4. Connect negative battery cable.

Removal & Installation

1. Disconnect negative battery cable.
2. Partially drain cooling system.
3. Remove upper radiator hose.
4. Disconnect cooling fan electrical connector.
5. Remove cooling fan mounting bolts.
6. Remove radiator cooling fan assembly from vehicle.
   
   
   Fig. Removal and installation of the radiator fan-2.7L Engine shown
   

To install:

1. Position radiator cooling fan assembly in vehicle.
2. Install cooling fan mounting bolts. Tighten to 50 inch lbs. (6 Nm)
3. Connect cooling fan electrical connector.
4. Install upper radiator hose .
5. Fill cooling system.
6. Operate engine until it reaches normal operating temperature.
7. Check cooling system and automatic transmission for correct fluid levels.

Hope helps (remember comment and rated this).

Escalade, Suburban, Tahoe, Yukon, Denali, DenaliXL, YukonXL 1999-2005 Water Pump - Removal & Installation 4.8L, 5.3L & 6.0L Engines

1. Remove or disconnect the following:
   Air outlet duct Coolant Inlet radiator hose from the water pump Upper fan shroud Cooling fan and clutch assembly Drive belt Radiator outlet hose from the coolant pump Surge tank hose Heater hose Water pump
   
   
   Fig. Exploded view of the water pump assembly-4.8L, 5.3L and 6.0L engines
   

To install:

NOTE DO NOT use cooling system seal tabs (or similar compounds) unless otherwise instructed. The use of cooling system seal tabs (or similar compounds) may restrict coolant flow through the passages of the cooling system or the engine components. Restricted coolant flow may cause engine overheating and/or damage to the cooling system or the engine components/assembly.

1. Install or connect the following:
   Water pump. Install the water pump bolts. Tighten the water pump bolts first pass to 11 ft. lbs. (15 Nm); tighten the bolts final pass to 22 ft. lbs. (30 Nm). Water pump drive belt pulley and bolts (if applicable). Tighten the pulley bolts first pass to 89 inch lbs. (10 Nm); tighten the bolts final pass to 18 ft. lbs. (25 Nm). Surge tank hose Heater hose Outlet radiator hose to the coolant pump Drive belt Cooling fan and clutch assembly Upper fan shroud Inlet radiator hose to the water pump Air inlet duct Coolant

1. Remove or disconnect the following:
   Air inlet and outlet duct Coolant Inlet radiator hose from the water pump Upper fan shroud Cooling fan and clutch assembly Drive belt Radiator outlet hose from the coolant pump Surge tank hose Heater hose Water pump
   
   

To install:

1. Install or connect the following:
   Water pump. Install the water pump bolts. Tighten the bolts to 11 ft. lbs. (15 Nm) for the first pass; then tighten to 22 ft. lbs. (30 Nm) for the final pass. Water pump drive belt pulley and bolts (if applicable). Tighten the bolts to 89 inch lbs. (10 Nm) for the first pass; then tighten to 18 ft. lbs. (25 Nm) for the final pass. Surge tank hose Heater hose Outlet radiator hose to the coolant pump Drive belt Cooling fan and clutch assembly Upper fan shroud Inlet radiator hose to the water pump Air inlet and outlet duct Coolant

Hope this help to solve it (remember comment and rated this).

Removal and Installation
On all engines

1. Drain the engine cooling system. For additional information, refer to Cooling System Draining, Filling And Bleeding in this section.

1. Remove the upper radiator sight shield.

1. Remove the air cleaner outlet tube. For additional information, refer to Section 303-12 .

1. Remove the six bolts and the two radiator upper support brackets.

1. NOTE: 3.9L shown; 3.0L similar.
   Remove the upper radiator hose.

1. Remove the bolt and position the receiver drier aside.

1. Disconnect the dual flow coolant valve electrical connector and the A/C line from the fan shroud.

On 3.0L engines

1. Disconnect the throttle position (TP) sensor and the idle air control (IAC) valve electrical connectors.

1. Remove the bracket.
   1. Remove the bolts.
   1. Remove the bracket.
1. Disconnect the high pressure cooling fan bracket and line.
1. Using the appropriate special tool, install a new O-ring on the power steering pressure hose fitting.
1. Separate the return hose from the fan shroud and position aside.
1. Remove the two bolts and position the fan shroud assembly.
1. Disconnect the return hose from the cooling fan and shroud and remove the cooling fan and shroud assembly.
1. Remove the A/C condenser. For additional information, refer to Section 412-03 .
1. Disconnect the lower radiator hose.
1. Remove the two bolts and position the multi-cooler assembly aside.
1. Remove the bolts and the condenser support brackets.
1. Remove the radiator.