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Nissan frontier 01, leaks coolant back of engine

The leak seems to be coming from a pipe that is attached to the back side of the thermostat housing. does any body know what the problem would be and how to fix it.

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  • Anonymous Mar 19, 2014

    thinking it could thermostat housing



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Tie the clamp

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I have a coolant leak that is coming from the drivers side area near the air filter and top of transmission. Are there any coolant hoses on that side, I cannot see if the water is coming from a hose or...

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How do i remove a thermostate on a 2001 chevy cavilier

NOTE: When adding coolant, it is important that you use GM Goodwrench DEX-COOL® (orange colored, silicate free) coolant meeting GM specifications. On these vehicles, if silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner; at 30,000 miles or 24 months.
  1. Disconnect the negative battery cable.
  2. Properly drain and recover the coolant until the level is below the thermostat.
  3. Unfasten the coolant outlet-to-inlet manifold attaching bolt and nut, then remove the outlet.
  4. Remove the thermostat. Clean the inlet manifold and outlet mating surfaces. To install:
  5. Install a new O-ring onto the thermostat
  6. Place the thermostat in the inlet manifold.
  7. Attach the coolant outlet to the inlet manifold, using the bolt and nut. Tighten to 89 inch lbs. (10 Nm).
  8. Refill the engine cooling system.
  9. Connect the negative battery cable, then start the engine and check for coolant leaks.
2.3L and 2.4L Engines NOTE: When adding coolant, it is important that you use GM Goodwrench DEX-COOL® (orange colored, silicate free) coolant meeting GM specifications. On these vehicles, if silicated coolant is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner; at 30,000 miles or 24 months.
  1. Disconnect the negative battery cable.
  2. Properly drain and recover the coolant to a level below the thermostat.
  3. Unfasten the cover-to-outlet pipe bolt, which is accessible through the exhaust manifold runners.
  4. Raise and safely support the vehicle.
  5. Disconnect the radiator and heater hoses from the outlet pipe.
  6. Unfasten the outlet pipe-to-oil pan bolt and the cover-to-outlet pipe bolts.
  7. Remove the thermostat, then clean the old gasket material from the mating surfaces. To install:
  8. Position the thermostat in its correct location, then install the cover-to-outlet pipe bolt. Tighten the bolt to 10 ft. lbs. (14 Nm).
  9. Install the outlet pipe-to-oil pan bolt. Tighten the pipe-to-oil pan bolt to 19 ft. lbs. (26 Nm) and the pipe-to-transaxle bolt to 40 ft. lbs. (54 Nm).
  10. Connect the radiator and heater hoses to the outlet pipe.
  11. Carefully lower the vehicle.
  12. Install the cover-to-outlet pipe bolt through the exhaust manifold runner.
  13. Properly fill the cooling system, then connect the negative battery cable.
The thermostat is located in the lower radiator hose on the 2.2L engine


Thermostat removal and installation - 2.3L and 2.4L engines


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Cant get to thermosts housing unit on 01 Nissan Xterra

Nissan Frontier, Xterra 1998-05
Thermostat Removal & Installation - 3.3L Engine


Fig. Thermostat assembly and related components-3.3L engine (clock over pic for zoom)

NOTE Never remove the radiator cap when the engine is hot. Serious burns could occur from high-pressure engine coolant escaping from the radiator.
  1. Be sure the engine is cold.
  2. Disconnect the negative battery cable.
  3. Drain the coolant. Properly disposed of used coolant.
  4. Remove the upper and lower radiator hoses. Remove the fan shroud.
  5. Remove the drive belts and the pulley bracket.
  6. Remove the water inlet retaining bolts.
  7. Remove the water inlet and the thermostat.
To install:
  1. Installation is the reverse of the removal procedure.
  2. Be sure to apply a continuous bead of the proper grade and type RTV sealant to the housing.
  3. Install the thermostat with the jiggle valve or air bleeder at the upper side.

    Fig. Thermostat jiggle valve/air bleeder location-3.3L engine
  4. Be sure to refill the cooling using the proper grade and type engine coolant.
  5. Start the engine and check for leaks.
  6. Start the engine and allow it to reach operation temperature. Recheck the coolant level, fill as required.
Hope helps (remmeber rated this).

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If its leaking at the rear its probably not the pump, the pump is in the front. It could be the rear of the intake manifold gasket.Or a heater hose that routed over the rear of your engine. Someone really needs to see where the fluid leaking out to make the call. Try to get a good strong flash light on the leak.Maybe even try lay on you back and slideing under with the light and look up the back side of your engine while its leaking. Engine in park of course. Eye protection needed here. Lay off to the side and look up at an angle so you dont get the coolant on your face or skin. Wash well if you get wet.

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I have a coolant leak coming from the front of the engine. looks like it is leaking around the cam shaft pulley. The vehicle is a 2001 Nissan Frontier v6

Sounds like either the water pump or the thermostat housing. The water pump has a small hole in the bottom where the shaft comes through, when the water pump gets worn it will leak here so you know to replace the pump. The thermostat housing will be at the motor end of the upper radiator hose where it attaches to the motor. Hope this helps.

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