1995 Mercedes-Benz C-Class Logo
Ernest Moeti Posted on Oct 27, 2012
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5 minutes after i started the water becomes so hot the hoses nearly burst

The antifreeze water becomes hot ,so i don`t know if it is viscous fan failure or water pump

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Thomas Perkins

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  • Mercedes-Benz Master 15,088 Answers
  • Posted on Oct 27, 2012
Thomas Perkins
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My car is overheating. Have replaced worn Fanbelt. Checked hoses. I live in HOT Darwin. Could the thermostat be stuck?

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Should my thermostat be removed?

No It is there for a purpose and the problem that makes you consider the removal of the thermostat should be fixed . It is there to bring the coolant to correct operating temperature as quickly as possible and then to regulate the flow through the radiator to maintain a constant temperature. The easiest check for a thermostat problem is to start the engine cold and let idle for around 10 minutes Place your hand on the top radiator hose and if the thermostat is ok you will feel the hot water start to flow through the hose. If you have the radiator cap off you will feel the water heat up and you may see the water start to flow as well.. Over heating problems can come from blocked or partially blocked radiator cores, leaking head gaskets or cracked head, thermostat, old soft hoses, timing , air/fuel mixture, blocked exhaust, overload /over speed , wrong gear resulting in excessive rpm's, coolant fan not working, viscous fan hub not driving fan, loose fan belt, blocked fins of the radiator( plastic-grass-mud)
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1996 olds aurora runs hot when idling or low speed normal at fast speed what could the problem be

If you have a viscous fan hub The one where the fan spins free on the water pump then the symptom you describe is a result of it not working any more. With the engine cold start the engine and run at around 2000rpm If the fan is working properly you will hear the air noise from the fan for a few seconds then the noise will dissapear as the fan slows down. When the engine is hot viscous fluid ( silicon ) is pumped from one side in the fan hub to the other creating drag which makes the fan spin and draw air through the radiator. If this is not happening then the fan is stalled by the load of trying to move air and as such the temp rises. As you move off the air flows through the radiator and the fan becomes useless until you stop again. Noemal fix is a new viscous hub. If you have electric fans check that they are working as planned
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Replacing water pump

This is for the 3.9 v6 you did not specify motor size.
Hope this helps, it it does please leave feedback Thank You and Good Luck


The water pump can be removed and installed without discharging the air conditioning system (if equipped).
  1. Disconnect battery negative cable.
  2. Drain cooling system.
  3. Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse.
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.


  1. Remove upper radiator hose clamp and hose at radiator.
Fan Blade And Viscous Fan Drive-3.9L/5.2L/5.9L Engines 81898572


  1. 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. A Snap-On 36 MM Fan Wrench (number SP346 from Snap-On Cummins Diesel Tool Set number 2017DSP) can be used. Place a bar or screwdriver between water pump pulley bolts to prevent pulley from rotating. Do not attempt to remove fan/viscous fan drive assembly from vehicle at this time.
  2. If water pump is being replaced, do not unbolt fan blade assembly from thermal viscous fan drive.
  3. Remove fan shroud attaching hardware (two bolts at bottom-two clips at top).
  4. Remove fan shroud and fan blade/viscous fan drive assembly from vehicle as a complete unit.
  5. 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.
  6. Do not remove water pump pulley bolts at this time.
Automatic Belt Tensioner Assembly-3.9L/5.2L/5.9L Engines 81898573


  1. Remove accessory drive belt as follows: The drive belt is equipped with a spring loaded automatic tensioner. Relax tension from belt by rotating tensioner clockwise (as viewed from front). When all belt tension has been relaxed, remove accessory drive belt.
  2. Remove four water pump pulley-to-water pump hub bolts and remove pulley from vehicle.
  3. Remove lower radiator hose clamp and remove lower hose at water pump.
  4. Remove heater hose clamp and heater hose from heater hose coolant return tube.
Coolant Return Tube-3.9L/5.2L/5.9L Engines-Typical 81898574


  1. Loosen heater hose coolant return tube mounting bolt and remove tube from water pump. Discard the old tube O-ring.
Water Pump Bolts-3.9L/5.2L/5.9L Engines 81898575


  1. Remove seven water pump mounting bolts.
  2. Loosen clamp at water pump end of bypass hose. Slip bypass hose from water pump while removing pump from vehicle. Discard old gasket.
CAUTION: Do not pry water pump at timing chain case/cover. The machined surfaces may be damaged resulting in leaks.


Belt Routing-3.9L/5.2L/5.9L Engines 81898576
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How do I change a thermostat in a 2001 New Beatle VW

First you should drain the antifreez by opening the drain plug located by the lower radiator hose. Then take the upper radiator hose off. Then take the 2 bolts out that hold the housing on. Remove the housng and there is your thermastat. Accordind to VW they want you to put antifreeze on the o-ring I use RTV a little extra help sealing just don't put a lot on. The book says to put thermastat in housing and turn 1/4 turn to right. I'm not sure why but thats what it says. TIP If you close the drain plug now and put as much antifreeze in as you can makes it easyer to get air pockets out later. Mount your therrmostast housing back to block and tighten bolts. Again put as much antifreeze in that you can them put upper radiator hose back on. Again put as much antifreeze in that you can. Now come the hard part sometimes getting all the air out of the cooling system. Put the radiator cap on but loose run the engine till the cooling fan kicks on but keep checking the coolant level. WARNING ANTIFREEZE WILL GET ABOVE 200 DEGREES
both upper and lower radiator hoses should be hot and radiator full. If both hoses aren't hot you have an air pocket that you have to get out. To do this run the engine a couple minutes after the fan kicks on then turn engine off for 5 or 10 minutes and start over keep doing this till both hoses get hot and the air the fan is blowing is hot. Once this is doe yout ready to go. I hose off any antifreeze that got one car so if you see antifreeze under car you know something is leaking and not what was spilled. 254a047.pnga06a9b1.png
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2006 dodge dakota water pump replacement instructions 3.7L

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

  1. Disconnect battery negative cable.
  2. Drain cooling system. Refer to Draining and Filling found under Cooling System, Service and Repair.
  3. Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse. 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.
  4. Remove upper radiator hose clamp and hose at radiator.
  5. 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. A Snap-On 36 MM Fan Wrench (number SP346 from Snap-On Cummins Diesel Tool Set number 2017DSP) can be used. Place a bar or screwdriver between water pump pulley bolts to prevent pulley from rotating. Do not attempt to remove fan/viscous fan drive assembly from vehicle at this time.
  6. 6. If water pump is being replaced, do not unbolt fan blade assembly from thermal viscous fan drive.
  7. Remove fan shroud attaching hardware (two bolts at bottom-two clips at top).
  8. Remove fan shroud and fan blade/viscous fan drive assembly from vehicle as a complete unit.
  9. 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.
  10. Do not remove water pump pulley bolts at this time.
  11. Remove accessory drive belt as follows: The drive belt is equipped with a spring loaded automatic tensioner. Relax tension from belt by rotating tensioner clockwise (as viewed from front). When all belt tension has been relaxed, remove accessory drive belt.
  12. 12. Remove four water pump pulley-to-water pump hub bolts and remove pulley from vehicle.
  13. Remove lower radiator hose clamp and remove lower hose at water pump.
  14. Remove heater hose clamp and heater hose from heater hose coolant return tube.
  15. Loosen heater hose coolant return tube mounting bolt and remove tube from water pump. Discard the old tube O-ring.
  16. Remove seven water pump mounting bolts.
  17. Loosen clamp at water pump end of bypass hose. Slip bypass hose from water pump while removing pump from vehicle. Discard old gasket. CAUTION: Do not pry water pump at timing chain case/cover. The machined surfaces may be damaged resulting in leaks.

INSTALLATION

  1. Clean gasket mating surfaces.
  2. Using a new gasket, install water pump to engine as follows: Guide water pump nipple into bypass hose as pump is being installed. Install water pump bolts. Tighten water pump mounting bolts to 40 Nm (30 ft. lbs.) torque.
  3. Position bypass hose clamp to bypass hose.
  4. Spin water pump to be sure that pump impeller does not rub against timing chain case/cover.
  5. Install a new O-ring to the heater hose coolant return tube. Coat the new O-ring with antifreeze before installation.
  6. Install coolant return tube and its mounting bolt to engine. Be sure the slot in tube bracket is bottomed to mounting bolt. This will properly position return tube.
  7. Connect radiator lower hose to water pump.
  8. Connect heater hose and hose clamp to coolant return tube.
  9. Install water pump pulley. Tighten bolts to 27 Nm (20 ft. lbs.) torque. Place a bar or screwdriver between water pump pulley bolts to prevent pulley from rotating.
  10. Relax tension from belt tensioner. Install accessory drive belt.
  11. CAUTION: When installing the serpentine accessory drive belt, the belt must be routed correctly. If not, engine may overheat due to water pump rotating in wrong direction. Refer to Illustration above for correct belt routing. The correct belt with correct length must be used.
  12. Position fan shroud and fan blade/viscous fan drive assembly to vehicle as a complete unit.
  13. Install fan shroud.
  14. Install fan blade/viscous fan drive assembly to water pump shaft.
  15. Fill cooling system.
  16. Connect battery negative cable.
  17. Start and warm the engine. Check for leaks.
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How to replace a water pump on a 98 durango

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The water pump can be removed and installed without discharging the air conditioning system (if equipped).
  1. Disconnect battery negative cable.
  2. Drain cooling system. Refer to Cooling System-Draining and Filling.
  3. Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse. 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.
  4. Remove upper radiator hose clamp and hose at radiator.
  5. 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. A Snap-On 36 MM Fan Wrench (number SP346 from Snap-On Cummins Diesel Tool Set number 2017DSP) can be used. Place a bar or screwdriver between water pump pulley bolts to prevent pulley from rotating. Do not attempt to remove fan/viscous fan drive assembly from vehicle at this time.
  6. If water pump is being replaced, do not unbolt fan blade assembly from thermal viscous
  7. Remove fan shroud attaching hardware (two bolts at bottom-two clips at top).
  8. Remove fan shroud and fan blade/viscous fan drive assembly from vehicle as a complete unit.
  9. 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.
  10. Do not remove water pump pulley bolts at this time.
  11. Remove accessory drive belt as follows: The drive belt is equipped with a spring loaded automatic tensioner. Relax tension from belt by rotating tensioner clockwise (as viewed from front). When all belt tension has been relaxed, remove accessory drive belt.
  12. Remove four water pump pulley-to-water pump hub bolts and remove pulley from vehicle.






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3helpful
1answer

Changing the water pump on 2000 Jeep Grand Cherokee V6

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
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