Question about 2000 Dodge Durango

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Check engine came on, and the car wants to over heat

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  • kamparo Jun 16, 2009

    so it has nothing to do with the cooling fan control.....because one of my fans doesn't come on?

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engine over heat or run hot?


Bear in mind that any air (as well as gunk) trapped in the coolantlines will cause overheating, particularly higher up around the headgasket. This overheating can definitely cause warping and result in ablown gasket. This is especially common in cars with aluminum headgaskets. (I don't know how the Cougar was designed.) Always "burp" yourcoolant system after flushing.


Engine coolant is used to transfer heat from the engine to the radiator; if a coolant leak is present the engine will eventually overheat. Inspect the engine coolant level in the coolant reservoir tank; coolant level should be between the hot and cold marks. Always check the coolant level when the engine is cold, preferably over night. If the coolant level is not between the reservoir marks the cooling system may have a leak. - Engine Coolant Leaks

If engine overheating has occurred the coolant level will naturally be low due to expansion of the coolant from the extreme heat of the engine. This heat expansion forces coolant out of the radiator and coolant reservoir. To test for an engine coolant leak move the car to a dry smooth surface and allow the engine to cool. Remove the radiator cap and carefully (do not spill) add water until full, then re-install cap. Start engine and allow to run for about three to five minutes (do not allow to overheat) while the engine is running inspect the ground below the engine, if an engine coolant leak is present observe the location of the coolant drops, this will help determine where to start looking for the coolant leak (shut the engine off before inspecting).









If no coolant is observed two additional checks are needed for a complete test. With the engine off remove the engine oil fill cap and turn it over, if a milky oil condensation is present the engine may have a failed cylinder head or intake manifold gasket allowing coolant to leak internally. To inspect engine gaskets disassembly is required. Next, the car heater core must be inspected; the quickest way to check the heater core condition without removal the heater core is to inspect the passenger's side foot well compartment carpet for the presences of coolant. If coolant is present the heater core has failed and must be replaced or repaired. After necessary repairs have been made refill the cooling system with manufacturers recommended engine coolant and recheck operation

An engine thermostat is designed to regulate the flow of coolant from the engine to the radiator. This temperature sensitive valve is designed to open when the engine has reached operating temperature (190°-198° F). The operating temperature of 190°-210° F is used to help facilitate fuel combustion. When a thermostat fails it will either stop the coolant flow "stick closed" and overheat or fail to stop the coolant flow causing the engine to run colder longer than necessary. If the thermostat fails to "close" it will cause the coolant to continuously flow through the engine creating a diagnostic trouble code (check engine light) to be set. When a thermostat sticks closed it will cause the engine to overheat quickly, usually within 5 to 15 minutes of operation. To check for either of these conditions drain coolant and remove thermostat, (thermostat is located in the thermostat housing) if you are unsure of the location of the thermostat on your engine consult a car repair manual. Once you have removed the thermostat inspect the condition of the main body check for any cranks or broken pieces, also check the valve to make sure it is closed. If the valve is open the thermostat has failed and needs to be replaced. To check the operation of the thermostat prepare a pot of water on the stove top deep enough to cover the thermostat completely. Install the thermostat in the pot of water, turn the stove on a medium/high flame, the thermostat should open right before the water comes to a boil. If the water has boiled and the thermostat valve is still closed the thermostat has failed and needs to be placed.




Posted on Jun 16, 2009

  • 2 more comments 
  • mohammed marika thambi
    mohammed marika thambi Jun 16, 2009

    When the engine is running hot and the radiator
    fan should be on, check for 12 volts to the fan. If there is no voltage, there
    is a relay or sensor that has failed. If there is voltage, then the fan motor
    needs replacing.

    Check for blockage in the radiator.
    Flushing the cooling system will not fix a partially plugged radiator. Replace
    radiator with new to repair problem.



    Check the operation of your main radiator cooling
    fans. If these fans fail the car's self diagnostic program can not see the problem.
    Replace the radiator cooling fans to repair as needed, recheck system.

    Check for a partially plugged radiator. When the engine overheated
    sludge or debris may have been dislodged and plugged the radiator. Replace the radiator
    with new to repair problem.


    Your fan clutch maybe failing and needs to be replaced.
    Replace with new unit to recheck system.



  • mohammed marika thambi
    mohammed marika thambi Jun 16, 2009

    he new thermostat could be bad-retest
    it-continues to overheat bleed the cooling system - see below that
    don't work have the tests done.





    Always bleed air from cooling system after replacing coolant. Set heater for maximum heat. Remove radiator cap. Loosen drain plug
    and remove drain bolt (if equipped) from engine block. Drain coolant
    reservoir. Fill coolant reservoir to MAX mark with 50/50 water-coolant
    mixture. Loosen bleed bolt and fill radiator up to base of filler neck.
    Close bleed bolt when coolant flows out without bubbles. Tighten bleed
    bolt. With radiator cap removed, start and operate engine to normal
    operating temperature. Add coolant if necessary and check for leaks.




    Block and Pressure tests





    Have it block and pressure tested-do the block first to pinpoint a combustion leaking into the cooling system or a gas analyzer to sniff for hydrocarbons at the radiator fill neck.





    Pressure test: do not do a pressure test if there's leakage at the
    headgasket this might cause coolant into the cylinders and lock it up
    or bend a connecting rod if cranked thereafter. The headgasket should be repaired before doing the pressure test.





    If the block and pressure test passes check the following:
    Thermostat,Pressure test the Rad. cap,Clogged radiator,Fan
    clutch,Radiator electrical fan,collaspe hoses,water pump.

    it actually started blowing hot air from the
    vents, while maintaining constant temps in the middle of the gauge.
    However, once I started driving it, it was right back to the same
    routine of up and down readings and cold air. I have a mechanic
    (trusted family friend) that is going to block and pressure test the
    engine in an effort to locate the problem. He's said that the freeze
    plug problem will cost a lot to fix (cheap part, just lots of labor
    with dropping the transmission and all), but that it could be any
    number of other things. I'm in a money crunch, so I'm hoping it's not
    too bad. If you have any ideas on pricing or what things "should" cost,
    be sure and pass them along.
    am at witts end like you, cant fig this out, but
    as far as freeze plugs my husband is no mechanic and he was able to do
    2 freeze plugs, all you have to do is jack up front of truck, if you
    still have them keep them, unlike us they dissapeared and it was hard
    to find a match, what the computer at parts store said was not the real
    ones,


    still having problem with overheating tooo.








  • mohammed marika thambi
    mohammed marika thambi Jun 16, 2009

    had a problem with overheating also but no leaking. I installed a new thermostat but it did not solve problem. Had to have a new radiator
    installed....apparently a malfunctioning or blocked raadiator core


  • mohammed marika thambi
    mohammed marika thambi Jun 16, 2009

    the problem is in the resistor. i know in some
    ealier models the resistor is located behind the dash at the very top
    in the center, right near the windsheild. when a resistor goes bad
    you'll loose the other fan speeds. i would change out the blower motor
    too. it's been known that the blower motor can cause the resistor to go
    bad.


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