Question about 1991 Lexus LS 400

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I have chanage the radiator, water pump, top cellinder gasket and radiator fan blared. but my ls400 is still overheating. whet do i do for it to stop

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  • ishangel1978 Apr 27, 2010

    The radiadtor is new, we dont use thermostat in Nigeria the thermostat is remove. The head gaskets were blown & was plane & water was fill but no coolant & there is no oil in the water.

  • Ned  White
    Ned White May 11, 2010

    You got something going on there. Is the radiator new? You changed out the head gaskets? Were they blown? Did you plane the heads? Did you fill it with water or coolant? What about the thermostat? Does it blow steam out the exhaust when driving? Did you check the oil for water? Did you check the oil? Something is wrong in this picture, I need more info.

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  • Lexus Master
  • 2,100 Answers

You need the thermostat, we used to try to run cars without them here in Florida, but it doesn't work, and the coolant is a must. Water boils at 120, coolant boils at 265 in a sealed unit, like a radiator. So, if you are running straight water, you can see how it won't even reach operating temp of 200 degrees without boiling over, or building up too much pressure. Even a little glycol mixed with water would be better than none. Hope this helps.

Posted on Apr 27, 2010

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  • Master
  • 434 Answers

First would be the thermostat. If you have already done so, change the temperature sending unit.

Posted on Apr 26, 2010

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2002 Chrysler Concorde 2.7 L overheating, changed, thermostat, water pump, air intake gasket and still overheating


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It sounds like the water pump is ok, however If the fan is operating properly you may have a partially obstructed radiator. That can be cleaned and flushed to see if that helps. You will need to replace the antifreeze at that point.

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2001 Montero Sport, 3.0, 4X4: New water pump and thermostat (170 deg). When accelerating from a stop, a (flowing) noise is heard: It is almost a 'trickling' sound, like the sound you hear in a...


if your sure the cooling system is full than i wouldn't be surprised if you had a head gasket that has failed.

This would explain the water noise, and overheating.

With the engine cold remove the radiator cap, start the vehicle and let it idle. continue to monitor the coolant level in the radiator. top it off if it gets low. If you see a constant perculation of air bubbles coming out of the radiator than the head gasket is bad.

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Second, if this car has electric fans, are they running when they are supposed to? If not, replace the fan control module, and/or test/replace the fan motors.

When the radiator was replaced, were you certain to purge the radiator and engine of all air before replacing the radiator cap? When you refill an emptied system, you always start the engine and watch the fill level in the radiator, refilling as necessary until you know the thermostat has opened. You need to have the heatrer controls set to full hot as well. Once the radiator is filled, put the cap in place, and fill the reservoir to the level indicated for a hot engine.

Finally, check to make sure the lower radiator hose is not collapsing while driving. While this is difficult to check (because your going down the road), just replace it when you replace the thermostat.

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1 Inspect Cooling System Mix Coolant level low or flow is restricted. grey_line.gif 2 Inspect Belt Incorrectly routed, adjusted, tensioned, missing, or worn water pump belt(s). grey_line.gif 3 Inspect Oil Pan Gasket - Performance Ruptured, cracked or leaking radiator hose. grey_line.gif 4 Inspect Radiator Cap Worn or damaged radiator cap grey_line.gif 5 Inspect Thermostat Thermostat stuck closed grey_line.gif 6 Inspect Fan Blade Broken, missing, or defective fan blade(s). grey_line.gif 8 Inspect Water Pump Damaged, worn or leaking water pump. grey_line.gif 9 Inspect Intake Manifold Plenum - Perform Leaking water pump gasket. grey_line.gif 10 Inspect Cooling Fan Control Faulty cooling fan control or circuit. grey_line.gif 11 Inspect Cooling Fan Switch - Radiator Faulty radiator cooling fan switch or circuit. grey_line.gif 12 Inspect Engine Temperature Sensor Faulty engine temperature sensor or circuit. grey_line.gif 13 Inspect Temperature Switch Damaged or faulty temperature switch or temperature switch circuit. grey_line.gif 14 Inspect Fan Clutch Worn, loose or faulty fan clutch. grey_line.gif 15 Inspect Ported Vacuum Switch Damaged, leaking, or faulty ported vacuum switch. grey_line.gif 16 Inspect Radiator Obstructed radiator core or radiator cooling fins. grey_line.gif 17 Inspect Head Gasket - Performance Head gasket leaking coolant into cylinders

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1 Answer

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