LINCOLN LS, Overheated and coolant leak


Asked by Aug 26, 2016 at 09:17 PM about the 2005 Lincoln LS V8 Sport

Question type: Maintenance & Repair

I have a 2005 Lincoln LS V8 with 84,000 miles.  No problems until yesterday.  After driving only two blocks it made a humming noise, and the needle on the temperature gauge spiked.  I turned the ac off, and drove the car two blocks back home.  Then I noticed a huge loss of coolant under the car.
After letting the car cool down, I replaced the coolant that was loss (almost two gallons), and tried to drive the car to see if I could see where the leak was coming from.  I drove the car around the neighborhood, but I could not get it to overheat, and there was no noticeable coolant loss.
I need to figure out what caused the overheating and the significant fluid loss.  All the hoses appear intact.  The belt appears intact. The water pump was replaced a few years ago, and I don't notice any cracks or leaks around the reservoir tank.  
When the car overheated, the warning on the dash was to check the engine temperature. One thing I did notice was that the temperature gauge inside the car spiked when it was overheated, but when I pulled it in the garage and put it in park the temperature gauge returned to normal.
Has anyone experienced anything similar to this, or have knowledge of the car, so I can start going down a checklist.

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