Parts to be replaced

Thread on fan clutch is left hand you need to turn it clockwise to undo it

The question is: How remove clutch in order to remove fan mounted on its engine-side face.

• Generally, the clutch drive half shaft must be uncoupled from coolant pump (impeller drive) half shaft using special wrench kit available as loaner from AutoZone (free with $79 approx deposit).
• Best done after shroud & radiator remove after coolant drained.

1. Uncouple coolant pump and fan clutch drive shaft(s) as follows:
   
   1. span across combo-pulley-sheaves-unit mounting bolt heads with large tool kit wrench, and
   2. span inline clutch coupling nut with small tool kit wrench. Then,
   3. turn small wrench (and coupling nut) CW while resisting with large wrench (CCW) to turn coupling nut until disengaged from coolant pump drive shaft.
2. Remove fan/clutch assembly.
3. Note direction of mounted fan hub and fan blades orientation to ensure proper re-assembly.
4. On rear of clutch assy, remove 4 bolts to disengage and remove fan.
5. Assemble new fan to clutch (or, preferably, new clutch and new fan) using new bolts and washers provided with fan.
6. Couple fan-clutch assy to coolant pump drive shaft as per opposite of uncoupling step 1, above. (Turn inline nut CCW to tighten...30 ft-lb.
7. Check that fan can be hand turned...CW.)
8. Rest shroud over and onto fan.
9. Replace radiator; remount shroud; reclamp hoses, and refill and air purge cooling system.

There may be a tool, or you jam a metal tool between two metal parts.
check these out:


Removing Stubborn Clutch fan Ranger Forums The Ultimate Ford Ranger...

Fan clutch removal

you must remove fan shroud. theres a tool for the clutch fan but you can use a impact hammer and a 12" bit (left hand thread) loosen pully bolts before removing belt (belt will hold pully from turning) then remove 4 or 6 bolts holding pump on (look at new pump for bolt amounts not sure) clean serfices and install)

You have to purchase or make a tool to hold the pully stationary as you unscrew the fan from the water pump shaft. I bought a strap of steel 1/8" thick and 1 1/2" wide and 24" long at the hardware store. I then drilled two holes in it close to one end, and close to one side of the strap. The hole diameter is just big enough to fit over the heads of the 10 mm bolts that hold the pulley in place. Note that the bolts are in a rectangular pattern. It is best to space your holes to fit two bolts that are the long side of the rectangle. Then I had to grind a half-moon shape into the side of the strap between the holes to allow for the shaft so the tool would get close enough for my little holes to fit over the bolt heads. If this is unclear, you should be able fine a picture of the tool on an automotive tool website.
Then I use a crescent wrench with extra narrow jaws to turn the nut on the fan clutch that screws onto the water pump shaft. This is a lot easier if you remove the air filter box so you can get to that nut easily.
Most important - that nut that holds the fan clutch on the water pump shaft is LEFT HANDED THREAD. Turn it clockwise to unscrew it.

The fan clutch is threaded onto the water pump. They make a tool to hold the pulley from turning so you can turn the large hex part of the clutch. You can probably rent one for free from a parts store like autozone or the like. Keep in mind some clutches are left hand threads also keeping the belt on the pulley also helps the pulley from spinning also.

The waterpump on a chevy suburban can be removed once you remove the radiator fan.

1. Drain the coolant from the system.
2. Here is a way to remove the fan clutch withouy a fan clutch tool. The trick is to leave the belt on and tight.
3. Take a 1 7/16 inch wrench and put it behind the fan onto the big shaft nut attaching the fan to the water pump. P
4. ut it straight up and crack it counterclockwise with a hammer.
5. This should loosen the nut.
6. After that just spin the fan off and the rest is easy.
7. Make sure you clean the old seal off of the engine. It is small and easy to miss.
8. remove the serpentine belt.
9. remove the hoses connecting to the water pump
10. remove 4 bolts holding the water pump onto the block
11. clean the block of any old gasket
12. fit the new waterpump and new gasket.
13. connect the hoses to the pump.
14. refit the serpentine belt
15. refit the fan
16. refit the rad and cowling
17. fill it up with coolant.
18. Run the engine and check for leaks.

The text below is from the GM Service manual 4.3L V6 Engine
Water Pump Replacement (4.3L)
Removal Procedure
Drain the cooling system. Refer to Draining and Filling Cooling System .
Loosen the water pump pulley bolts.
Remove the cooling fan and clutch assembly.

Tools Required
J 46406 Fan Clutch Wrench

Removal Procedure
Remove the upper fan shroud.
Remove the fan clutch from the water pump in a counterclockwise direction using the J 46406 .
Remove the fan clutch assembly.
Remove the drive belt. Refer to Drive Belt Replacement Remove the water pump pulley mounting bolts.
Remove the water pump pulley.
Remove the radiator outlet hose clamp from the water pump.
Remove radiator outlet hose from the water pump.
Remove the water pump mounting bolts.
Remove the water pump from the engine.
Remove the water pump gaskets.
Clean the water pump gasket mating surfaces.
Installation Procedure
Install the water pump gaskets.
Install the water pump to the engine.
Apply a sealer (GM P/N 12346004) to the bolt threads.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Install the water pump mounting bolts.
Tighten
Tighten the mounting bolts to 41 N·m (30 lb ft).
Install the radiator outlet hose to the water pump.
Install the water pump pulley.
Install the water pump pulley bolts.
Tighten
Tighten the water pump pulley bolts to 25 N·m (18 lb ft).
Install the drive belt. Refer to Drive Belt Replacement in Engine Mechanical - 4.3L.
Install the fan clutch assembly.
Fill the radiator cooling system. Refer to Draining and Filling Cooling System .
Inspect the cooling system for leaks.

Very tricky there what your asking you need to remove alot of parts to get it done but its possible.
You must remove the radiator than the engine plastic cover than remove all the belts and everything in the way. Along with being able to remove the reverse threaded fan clutch which you need a special tool to hold it while you undue the 22mm or 32mm bolt from the fan clutch bolt than you remove all the water pump bolts good luck

the hardest part of this job is removing your fan clutch. you removed your top fan shroud, then your fan clutch, its reverse thread. take off your belt, upper radiator hose and 6 10mm bolts hold it in. clean water pump housing and put all back together. aftermarket water pumps do not come with theermostat, dealer pumps do. remove your belt tensioner from old water pump 3- 15mm bolt, two different sizes and install on your new pump. you need, 10mm socket, 15mm socket, flat head screw driver, pliers to removed hose,fan clutch tool(rent at autoparts store)