Question about 2003 Chevrolet TrailBlazer

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Fan is loose and can wiggle the whole part with the drive belt on it where it is against the engine block

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  • wda0220 May 10, 2010

    would a bad belt cause that assembly to be loose,because the bely does need a change but ut started making noise yesterday and thats wheni noticed it loose and noticed belt had a lot of cracks ,i hope it can be that simple..

  • wda0220 May 10, 2010

    just would like other opinion i hope your solution is correct and its that easy

  • wda0220 May 10, 2010

    thank you iwas reading haynes and i yhink that is the problem thanks again


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when u move the fan blade does the pulley that drives the fan belt move or just the fan blade? if the pulley moves the water pump front bearing is worn out, if just the fan moves then u will need to replace the fan clutch it has a worn out bearing, most of the time it is the water pump bearing that is worn out, the water pump is directly behind the fan pulley and is held into the engine block cooling passage by 4 bolts, it is a flange type pump that is flush with the block, below u will see a picture of the water pump and a part number.

GATES Part # 41122 {Water Pump (Standard); $31.89

fan is loose and can wiggle the whole part with - 8429490.jpg

Posted on May 10, 2010

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  • Chevrolet Master
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Put a wrench on the tensioner pulley. Turn in the direction that will introduce slack to the belt. This task also work for remove and replace.

For more info visit our enthusiasts forum at

  1. The diagram is printed on a sticker adhered either to the fan shroud or underside of the hood. This diagram illustrates how the belt routes around the various pulleys. If the sticker is missing, you can get one at your local auto parts store, Chevrolet dealer or online.
  2. Pull the serpentine belt tensioner pulley aside with the belt tensioner tool. The end of the belt tensioner tool plugs into the side of the tensioner body to allow you to move the tensioner. Push the belt off the tensioner pulley with your free hand once the belt slackens. You can move the tensioner with a pry bar or large socket wrench, but using the wrong tool can quickly lead to a broken tensioner. Save yourself the aggravation of broken parts by simply using the right tool, which you can purchase at most auto parts stores or professional tool retailers for far less than the price of a new tensioner. Take the tensioner tool out once the belt is off the pulley by carefully releasing your hold on it and pulling it out of the tensioner body. Make sure to set the tool within easy reach.
  3. Pull the belt of all the pulleys and then take it out of the engine bay. Slip one end of the old belt and the new belt around your foot and pull the other end of both belts upward to compare lengths. The new belt should be roughly 1/2-inch shorter than the old belt. This variation in length is due to stretching during the belt's lifespan.

Hope helped.

Posted on May 10, 2010

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Knocking noise from motor when you turn a/c on it goes away Also car is over heating what could it be

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Check the help link mentioned below:----

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Changed thermostat,relay,tophose everything,radiator switch,.still the engine gets heated if we run the car above 50km/hr speed.It is normal when we drive inside 50km/hr.Radiator fan also not rotating.wht...

Sounds like your fan belt is glazed or loose. At higher speeds the belt slips over waterpump and doesn't drive pump fast enough to circulate coolant. That would be first thing I would check...
Other possibilities: waterpump, blocked heater core, fan clutch.

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Water pump going out how do i replace it

  • Removal of the Fan Shroud and Drive Belts
    • 1 Drain the cooling system. Place a waste oil collection pan underneath the petcock valve on the lower corner of the radiator. Open the petcock valve to drain the system.
    • 2 Remove the bolts that connect the fan shroud to the radiator core and remove the fan shroud.
    • 3 Loosen the alternator adjustment bolt and slide the alternator toward the engine. Remove the drive belt.
    • 4 Loosen the adjustment bolt for the air conditioning compressor, and slide the compressor toward the engine. Remove the drive belt.
    • 5 Loosen the adjustment bolt on the power steering pump and slide the pump toward the engine. Remove the drive belt.
  • Removal of the Water Pump
    • 1 Disconnect the bypass hose from the water pump by loosening the hose clamp and pulling the hose off the fitting.
    • 2 Remove the bolts that connect the water pump to the engine block, and remove the water pump and engine fan as an assembly.
    • 3 Remove the four retaining nuts that connect the fan assembly to the water pump. They will be located between the fluid coupling and the water pump pulley.
  • Installation of the Water Pump
    • 1 Attach the fan assembly to the new water pump by sliding the pulley then the fluid coupling onto the water pump and reinstalling the retaining nuts.
    • 2 Clean any old gasket material off the water pump mounting surface on the engine block.
    • 3 Place the new water pump gasket on the water pump mounting surface.
    • 4 Slide the new water pump into position and reinstall the mounting bolts.
    • 5 Reconnect the bypass hose by sliding the hose over the fitting and tightening the hose clamp.
  • Reinstalling the Drive Belts and Fan Shroud
    • 1 Reinstall the the drive belts for the power steering pump, air conditioning compressor and alternator. Tighten the adjusting bolts.
    • 2 Measure the deflection of each belt to make sure the belts are properly tightened. Measure deflection by placing a straight edge along the belt against the accessory pulley and the water pump pulley. Push down on the belt and measure the distance between the belt at the midpoint and the straight edge. It should be between 1/2 and 1/4 inch. Any more and the belt needs to be tightened. Loosen the adjustment and slide the accessory away from the engine to tighten.
    • 3 Drop the fan shroud into position and reinstall the bolts that secure it to the radiator.
    • 4 Close the petcock valve on the radiator and fill the cooling system with fresh coolant.
    • 5 Run the engine and visually inspect for leaks.

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    1 Answer

    Can see antifreeze leaking down over four wheel drive unit

    this can be a couple of different things. firt open the hodd and then start the truck, Keep away from the fan make sure you are not wearing any loose clothing. The waterpump has a wheep hole on it when the berings are giveing out in the pump it will push water threw the weep hole where most of the time down the block onto the transfer case......Other wise look for water comming out of top and bottom raditior hose...If it is a pump this is how to fix it..

    1)Drain the coolant.

    2)Remove the shroud: 7 - 10mm bolts

    3)Remove the fan and clutch: There is no need to separate the fan from the clutch. The whole thing threads on to the end of the water pump. Turning counterclockwise removes the fan, clockwise tightens it back on (from the point of view of standing at the front of the vehicle facing the engine compartment). I don't know the size, because rather than break out all my wrenches, I just grabbed an 18 inch crescent wrench. Place the wrench on the nut and tap loose with a hammer. The tapping will break it loose. You have to tap it, if you just try to loosen it, the belt won't hold it and the whole thing will turn. After it breaks loose just spin it off.

    4)Break loose the bolts holding the pulley on: 4- 13 mm or 1/2" bolts. Just break them loose, don't remove them.

    5) Remove the serpentine belt.

    6) Remove the pulley: Finish removing the bolts holding the pulley and remove the pulley.

    7) Disconnect the hoses.

    8) Remove the old pump: 4-14 mm or 9/16" bolts.

    9) Clean the surface: Remove all traces of the old gasket.

    10) Install new pump: Apply a bead of blue Permatex around the holes on both sides of the gaskets, put them on the pump and insert the bolts through the holes to hold the gaskets in place. Carefully lower the pump in to position. Thread the bolts into the block and snug them. Then remove the bolts one at a time, add the permatex to the threads, and then reinsert. (only do one at a time so that the pump doesn't shift and disturb the mating surfaces) Then tighten all the bolts.

    11) Reinstall everything in reverse.

    There will be a lot of air trapped in the system, so after you fill it, get the engine to operating temperature, shut it off, let it cool, then add more. The air trapped in the system can cause your engine to over heat if left unattended.

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    2 Answers

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    Changing the water pump on 2000 Jeep Grand Cherokee V6

    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)

    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.

    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.
    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

    Jan 10, 2009 | 2000 Jeep Grand Cherokee

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