1991 Lexus ES 250 Logo
Posted on Apr 25, 2009
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Radiator over heating,running on hot.with steam comming out overflow.temp gadge up and down on temp.car still running and starts.

3 Answers

Mike Butler

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  • Lexus Master 6,674 Answers
  • Posted on Apr 25, 2009
Mike Butler
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Check coolant level when cool. Make sure cooling fan at rad is working, and then I'd change thermostat.

  • Mike Butler
    Mike Butler Apr 25, 2009

    Wow! Did you type that up yourself?

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  • Master 6,784 Answers
  • Posted on Apr 25, 2009
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Ok, this is an unfortunate water pump failure. the best actions at this point is to shut down the vehicle before the heads begin to warp from the intense heat. I would let this car cool down considerably. Once the car is cool. you will need to run an inspection on the entire cooling system to confirm the actual failure at hand. Although, im quite sure of the issue, its always good to inspect the entire system for a possible combination of problems that may exist. The inspection guide reads as follows


There are a number of things that can go wrong with your car's cooling system, causing the engine to run warmer than it should. The following is a list of things that are easily checked at home by the do-it-yourself-er, and can always add to your knowledge of cars in general.

Step1
Understand that overheating problems may be caused by a low coolant level, the radiator being plugged, the thermostat may be stuck, or other related common cooling system problems.
Step2
Check the coolant level at the radiator overflow/plastic coolant reservoir tank to see if you're low on coolant (see "How to Check Your Car's Coolant Level," under Related eHows). Add if necessary.
Step3
Open the radiator cap and look inside the radiator when the engine is cold.
Step4
Fill the radiator with a 50/50 mix of antifreeze and water if it's empty or low, and close the cap.
Step5
Look at both the lower and upper radiator hoses located at the top and bottom of the radiator on the back side and held by hose clamps. Make sure the hoses are securely clamped to the radiator and aren't leaking.
Step6
Touch both the upper and lower radiator hoses when the engine is warm and the car turned off. They should both be somewhat warm. If one is cold, you may have a thermostat that's stuck closed.
Step7
Use the palm of your hand to feel the outside of the radiator from top to bottom when the engine is warm and the car turned off. It should be warm to the touch evenly throughout. If there's a cold section, you may have a radiator that's internally blocked.
Step8
Check under the car, inspect the radiator and look around the engine compartment for telltale signs of a coolant leak: Coolant is usually greenish, slippery and sweet-smelling.
Step9
If there is always a puddle of coolant under your car it could be due to water pump failure, or a cracked coolant reservoir.
Step10
Visit your mechanic if you know there's a leak but can't find it. A mechanic can detect a slow or small coolant leak by pressurizing the cooling system

  • Anonymous Apr 25, 2009

    TIPS AND WARNINGS TO BE AWARE OF


    # A loose fan belt or an electric fan that isn't working correctly can cause overheating even if there's enough coolant in the cooling system.
    # A loose water pump belt or a broken water pump can also cause overheating even if there's enough coolant in the cooling system.
    # You can add coolant and water to the plastic coolant reservoir tank when the engine is hot, but not to the radiator (except on German and Swedish cars - see Warnings).
    # Coolant is a 50-50 mixture of antifreeze and water. It's best to keep this ratio when adding or topping off the coolant reservoir tank or the radiator.
    # Pre-1970s cars often don't have a plastic overflow/coolant reservoir tank - you must wait for the engine to cool down before adding fluid. Some older models have a small bag attached.
    # Coolant can leak into the car (typically on the floor by the passenger's feet) if there's a leak in the heater core. When the heater core "goes out", often times the windshield will temporarily fog up from the inside.
    # Never drive your car when the needle on the temperature gauge (on your dashboard) reads in the red area - pull over and turn the engine off before you cause expensive engine damage.
    # Don't open the radiator cap on a car with a hot or overheating engine - the coolant is under pressure and could scald you.
    # German and Swedish cars have plastic coolant reservoir tanks that are also pressurized - don't open these tanks when the engine is warm or hot.
    # Coolant will kill or injure animals if ingested. Animals like the sweet taste of coolant, so wipe up any spills and don't leave open containers of coolant where animals can get to them.

    Please rate and god bless:)


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  • Expert 131 Answers
  • Posted on Apr 25, 2009
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Not to wise to drive an overheated engine, 2 things,
thermostat stack or water pump, also check antifreeze for
leaks and for low level.

gl G

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