Question about 2007 Lincoln MKZ

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2007 lincoln mkz keeps over heating after just driving about 10 minutes. Air condition is off and it is cool outside. We replaced the thermostat but that didn't fix it. I can hear water hitting the hose near the radiator, and can see hose move. Not sure what else it could be. It is 2400 miles over warranty.

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Your cooling system is half full of air it sounds like. With the engine cool start it up and remove the radiator cap leave it running. It will take probably 10 minutes for the thermostat to get hot enough to open up, when it does you will see the fluid in the radiator start to move and then I'll bet the level will drop where you can't hardly see any fluid. Fill your radiator with coolant and water, or just water better to use coolant as it won't build up as much with minerals from the water. It's best if you can pre-fill some gallon jugs of water so that it is warmer then straight out of the hose. Anyway after fluid drops fill up radiator with fluid and repeat until fluid level no longer drops. Then fill the overflow tank to the appropriate level. Let me know if you need more assistance by commenting back to this post. Good luck and I hope this fixes your problem.

Posted on May 25, 2011

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  • cLEOfus Jun 08, 2011

    WOW!! Thanks Particalzman! I was having the same problem! and this fixed my issue!! KUDOS.

  • Josh Jun 08, 2011

    No problem, glad to have been able to help. It's nice hear nice comments like yours thank you :)

  • israelmp Sep 16, 2013

    my mkz is also overheating and throws out air once the blk screw cap is removed. onced doing this procedure, will it occure again??

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I have the same exact car that had the same exact problem! My car kept getting an air pocket because the cap on the overflow tank was old and couldn't withstand the appropriate amount of pressure. I recommend checking that as well with this car. It took three mechanics in three different garages and about $1800 to figure it out and repair it correctly! I really hope this helps someone else who owns this same car!!

Posted on Sep 20, 2015

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That doesn't sound good. There could be other things wrong, but I would suspect a blown head gasket. you will need to check the top of the radiator fluid for oil floating in there. check for steam coming out the exhaust, and you could check the oil for water, but you should know something before you do that. Go to a radiator shop and for about $50, they will do a compression check and tell you exactly what cylinder it is and how much it will cost to fix. probably $2,000. It is a big job. Hope this helps.

Posted on May 25, 2011

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2 Answers

A/C recharged and thermostat replaced, now engine over heats in first 20 minutes of use. After 15 minute "cool down", engine runs fine and in normal temp. zone.


check that there is no air lock in the cooling system
check if the thermostat was installed with the body of the unit facing the block and not the hose

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Tip

Tips for operating Air conditioning system on Toyota Hilux and someother...


To cool off your Toyota after it has been parked in the hot sun, drive with the windows open for a few minutes. This vents the hot air, allowing the air conditioning to cool the interior more quickly.

Make sure the air intake grilles in front of the windshield are not blocked (by leaves or snow, for example).

On humid, do not blow cold air on the windshield. The windshield could fog up because of the difference in air temperature on the inside and outside of the windshield.

Keep the area under the front seats clear to allow air to circulate throughout the vehicle.

On cold days, set the fan speed to high for a minute to help clear the intake ducts of snow or moisture. This can reduce the amount of fogging on the windows.

When driving on dusty roads, close all windows. If dust thrown up b the vehicle is still drawn into the vehicle after closing the windows, it is recommended that the in intake be set to FRESH and the fan speed to any setting except "OFF".

If following another vehicle on a dusty road, or driving in windy and dusty conditions, it is recommended that the air intake be temporarily set to RECIRCULATE, which will close off the outside passage and prevent outside air and dust from entering the vehicle interior.

HEATING

For best results, set controls to;
Fan speed ---- Any setting except "OFF"
Temperature----Towards WARM (red zone)
Air intake ---- FRESH (outside air)
Air flow ---- FLOOR
Air conditioning ---- OFF

For quick heating, select recirculated air for a few minutes. To keep the windows from fogging, select fresh after the vehicle has been warmed.

Press the "A/C" button on for dehumidified heating.

Choose floor/windshield air flow to heat the voltage interior while defrosting or defogging the windshield.

AIR CONDITIONING

For best results, set controls to;

Fan speed --- Any setting except 'OFF"
Temperature --- Towards COLD (blue zone)
Air intake --- (outside air)
Air flow --- PANEL
Air conditioning --- ON

For quick cooling, move the air intake selector to recirculate for a few minutes.

VENTILATION

For best results, set controls to;

Fan speed --- Any setting except 'OFF"
Temperature --- Towards COLD (blue zone)
Air intake --- (outside air)
Air flow --- PANEL
Air conditioning --- ON

DEFOGGING

The inside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone) to heat; COLD (blue zone) to cool
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- ON

The outside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone)
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- OFF

On humid days, do not blow cold air on the windshield. The windshield could fog up because of the difference in air temperature on the inside and outside of the windshield.

DEFROSTING

The outside of the windshield

For best results, set controls to:

Fan speed --- Any setting except 'OFF"
Temperature --- Towards WARM (red zone)
Air intake --- FRESH (outside air)
Air flow --- WINDSHIELD
Air conditioning --- OFF

To heat the vehicle interior while defrosting the windshield, choose floor/windshield air flow.

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