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I have a 91 Nissan pickup d21 2.4 liter engine 2 wheel drive I have replace water pump thermostat radiator radiator hoses have bled the lines and it still runs hot water boiling in overflow.while truck is running hot I do not feel no water running through the top radiator hose but when you turn the truck off it seems to start to pull some of the water from the overflow through the top radiator hose I do not understand what to do or why its running hot?

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  • Cars & Trucks Master
  • 50,514 Answers

If you have a viscous fan hub then have it replaced as it is not moving the air through the radiator. Check how you placed the thermostat in the system as the bulb bit faces into the head or block so that it can sense the rising water temperature and open as required.. With not water moving through the hose I suspect that may be your problem

Posted on Oct 13, 2013


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: running hot

Radiator Fan Control Relay Switch. I bet your electric fan doesn't run?

Posted on Dec 01, 2008

  • 740 Answers

SOURCE: engine overheating-----1994 Olds Cutlass Supreme 3.4 liter v/6

There seems to be an air pocket or no antifreeze in engine block. Try this method disconnect upper radiator hose and pour water directly into hose down into engine block until it full. when its filled reconnect hose and fill up radiator. as the vehicle warms up open bleeder valve on the thermostat housing and release air from system. open slowly and BE VERY CAREFUL WATER WILL BE HOT, bleed until you get a steady stream opening and cosing valve. However if all of this don't work. You may have a bad pump. Good Luck

Posted on Dec 27, 2008

  • 7353 Answers

SOURCE: 2002 dodge 1500 Changed radiator, thermostat, and hoses. No heat

Why was radiator replaced?Did it have heat before ? If it was plugged, the heater core may also be plugged. Try flushing it with a water hose in both directions. I dont know why the botton radiator hose would be cold, the radiator should be a uniform temp and the air coming through the radiator should be HOT, when the engine is at operating temp. What condition was the old coolant? if it was rusty, the water pump may have lower flow than normal.

Posted on Nov 19, 2009

  • 477 Answers

SOURCE: 1995 Chrysler Cirrus overheating

Probably not water pump. Engine is notourious for vapour lock.
Cooling system must be blead of air before thermostat will work. Cool bottom rad hose is a dead give away. If you are still watching this forum reply , and I will walk you through the only way I know how to make it work properly. It's actually easy if you do it my way. I have worked on lots of cars , and this engine was the hardest to bleed out. Did one Yesterday , and works perfect.

Posted on May 16, 2010

Testimonial: "I need help on how to bleed the system thanks"

  • 130 Answers

SOURCE: replaced water pump, thermostat, radiator, top and


Posted on Aug 04, 2010

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1996 nissan altima no cabin heat, new radiator, flushed and filled, top hose hot, lower hose cold, newer thermostat checked good

HI Anon.
Remove your radiator cap (WHEN ENGINE IS COLD), run the motor and let it warm up a minute or two, have someone rev the engine a little while looking into the radiator. If the water goes down and/or you see the water moving, your water pump is good. If not this means that your water pump is bad and is not moving enough water through the system. Try Removing your thermostat and run the engine without it. Keep checking the radiator hoses to see if they are the same temperature. If they are not the same temperature the water pump is bad. If they are the same temperature your thermostat is more than likely the culprit. Hope this helps.

May 30, 2017 | Nissan Cars & Trucks

1 Answer

Have a 91 nissan pick-up staight 4 have it over heated oce replace thermostat and hose upper ran it for a day got hot again took out the thermostat and still gets hot what is the deal please help lee....

Replace the water pump, and also check for air in the system. Make sure the vehicle is cool, remove the radiator cap, start the vehicle and start pumping the lower radiator hose with your hand to help remove any air pockets in the cooling system. I would try this first before looking at the water pump or the fan since you let air into the system the minute that you removed the hose to install the thermostat and upper radiator hose

Jun 08, 2011 | 1991 Nissan Pickup

1 Answer

Replacing a thermostat on 2004 nissan sentra

  • Prepare for the replacement by disconnecting the negative battery cable and draining the engine coolant into a container--you need to remove the drain plug from the radiator first and then the drain plug at the engine block.

  • Remove the engine's cooling fan by loosening the fan/water pump pulley nuts, unclipping and removing the fan shroud's lower half, removing the water pump pulley nuts and pulling the fan out from underneath.

    Disconnect all components blocking access to the thermostat by removing their bolts. On four-cylinder engines, this includes the air cleaner, air intake duct and the power steering pump's support bracket. On a 3.3 liter V6 or SOHC engine, remove the upper radiator hose from the intake manifold's coolant outlet.

  • Slip off the drive belts blocking the thermostat by turning their tensioner bolts with a wrench or breaker bar. On a 3.3 liter truck or DOHC engine, follow this by removing the upper idler pulley bracket. On a 3.5 liter engine, remove the water pump drain plug from the front end of the block.

  • Detach all hoses from the thermostat housing cover by loosening the hose clamps with pliers; this usually includes the lower radiator hose. This is only needed on V6 engines; you will keep the hose attached on a four-cylinder.

  • Remove the thermostat housing cover by removing its bolts. There will be some coolant spilling out when the gasket seal breaks.

  • Disconnect and remove the thermostat from its cover by removing its screws. Take note of how the thermostat is positioned within the cover.

  • Scrape away all traces of gasket or sealant from the housing and cover and clean the surfaces with lacquer thinner.

  • Apply RTV sealant around the edge of the thermostat cover. You need to re-install the cover within five minutes of applying this sealant.

  • Mount the new thermostat into the cover in the same position the old thermostat was in.

  • Re-install the thermostat cover and all other parts in reverse order of installation.

  • Wait a half hour for the RTV sealant to cure before refilling the engine coolant. Use fresh coolant if the old coolant is contaminated.

  • Mar 20, 2011 | Nissan Sentra Cars & Trucks

    1 Answer

    I need to replace a thermostat in a 2000 Chevy 2500 6.0 liter pickup

    4.8L, 5.3L and 6.0L Engines To Remove:
    The thermostat is not serviceable separately. The thermostat housing (water pump inlet) and thermostat must be replaced as an assembly.
    1. Remove the radiator outlet hose. chevy_aval15_02-04_inlet.gif

    2. Remove the bolts from water pump inlet.
    3. Remove the water pump inlet from the water pump.
    To Install:
    1. Install the water pump inlet to the water pump.
    2. Install the water pump inlet bolts.
      • Torque to: 11 ft-lbs. (15 Nm)
    3. Install the radiator outlet hose.
    6.6L Engine To Remove:
    1. Before servicing the vehicle refer to the precautions at the beginning of this section.
    2. Drain the engine coolant.
    3. Remove or disconnect the following:
      • Water outlet 6.6L Thermostat housing removal gm_trk_sil25_02-04_66_therm_hous_rem.gif

      • Bolt for the fuel line bracket
      • Thermostat housing cover bolts
      • Thermostats and seals
    To Install:
    6.6L Thermostats and seals gm_trk_sil25_02-04_66_therm_seal.gif

    1. Install or connect the following:
      • Thermostats and seals to the thermostat housing NOTE: The rear thermostat (D) has 2 vent valves. Install with the vent valves towards the rear of engine.
      • Thermostat housing cover with a NEW gasket
      • Thermostat housing cover bolts and tighten the bolts
        1. Torque to: 15 ft. lbs. (21 Nm)
      • Fuel line bracket bolt and tighten the bolt
        1. Torque to: 15 ft. lbs. (21 Nm)
      • Water outlet
    2. Fill the engine with coolant.
    3. Test drive the vehicle to confirm the repairs.
    8.1L Engine To Remove:
    1. Before servicing the vehicle refer to the precautions at the beginning of this section.
    2. Drain the cooling system.
    3. Remove or disconnect the following:
      • Inlet hose from the water outlet Water outlet and thermostat removal chevy_sub25_02-04_60_thermost_rem.gif

      • Water outlet bolts (B)
      • Water outlet (A)
      • Thermostat (C)
    To Install:
    1. Install or connect the following:
      • Thermostat
      • Water outlet
      • Water outlet bolts and tighten the bolts.
        1. Torque to: 22 ft-lbs (30 Nm)
      • Inlet hose to the water outlet
    2. Fill the cooling system.
    3. Test drive the vehicle to confirm the repairs.
    prev.gif next.gif

    Jan 12, 2011 | 2000 Chevrolet 2500

    1 Answer

    1990 nissan maxima has no heat after changing thermostat and water pump AC works

    make sure system is well bled of air. Open radiator cap and start engine. Run until hot and thermostat is open (coolant flowing in radiator. Keep radiator full and also open any bleeder ports on thermostat housing or in hoses until no air comes out.

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    After spending 880 dollors on having a head gasket water pump and radiator replaced in my 1998 pontiac sunfire 2.2 liter it has no flow thru the brand new radiator engine runs supur hot 260 degrees in 2...


    Nov 11, 2009 | 1998 Pontiac Sunfire

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    No heat

    You probably just need to backflush your heater core. You can use a hose to flush it back and then forward. You'll be surprised at how much sludge and gunk will come out.

    Jan 21, 2009 | 2004 Dodge Ram 1500

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    Troubleshooting air conditioner thermostat 1995 nissan pickup hardbody

    The thermostat is located where the lower radiator hose goes into the engine. I've had to replace mine, and it took a while to find it. I found the easiest way to get at it is to remove the power steering pump (hoses attached) and set it over to the side to get at the bolts on the thermostat housing.

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    Jun 25, 2008 | 1995 Nissan Pickup

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    Car runs hot

    it is most likely your heater core

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