Question about 1999 Ford Expedition
Flushed cooling system changed out thermostat. While driving no more than 5 miles temp gauge went up almost to red line then went back down. Noticed fluid bubbling out of radiator cap. Thought it just might be air so I let some air out. Drove again this time temp went high after not even a mile. What could be wrong? No leaks other than coming out of radiator cap.
First i would purchase a new radiator cap 15 lbs 16 lb capacity cost about $7..then you must let car cool completely...now check radiator coolant level.. top off if it needs it. Now install new cap..let car warm up normally and after it get to normal temp range or higher put hand on upper radiator hose..it should feel hot and when you squeeze it you should feel a slight back pressure..this will mean that the thermostat and water pump are working correctly. if not either the thermostat you purchased is defective or your pump may not be working properly.
when you use just water in an engine the boiling point becomes 212 when you add the correct amount of antifreeze, depending on where you live, the boiling point will go up to 240 degrees. Make sure you put in the correct amount of mix.50/50 will usually work well. sometimes when a gauge does max out like that it could just be trapped air. if after you checked all this out and no air is trapped in the system, i would think that you may have a bad temp sensor. let me know if this helped thanks.
Posted on Apr 28, 2010
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Posted on Jan 02, 2017
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