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Because of the dual zone a/c-heating system, instead of using rubber Ford chose to use steal or aluminum tubing from the front to the back.
More than likely the tubes have made contact with metal and with normal driving conditions have rubbed a hole in the tube. maybe just a leaky connection to the heating core or worse a heating core with a hole in it.
Plus i don't know if it is true or not but using two different kinds of antifreeze can compromise the entire cooling system (heating system too).
What else can I help you with?
Why does coolant leak from right rear side 2000 expedition?
Fluids in a vehicles must be maintained to keep it running well. Coolant leaks because there is a crack somewhere, a tube is torn, or the clamp is too loose.
Rear axel removal on 1998 Ford Expedition?
how do you remove the right rear axle on a 1998 ford expedition?
What is the rear shoulder room of the 2011 Ford Expedition?
The 2011 Ford Expedition has 63.7 in. of rear shoulder room.
What is the rear leg room of the 2007 Ford Expedition?
The 2007 Ford Expedition has 39.1 in. of rear leg room.
What is the rear leg room of the 2013 Ford Expedition?
The 2013 Ford Expedition has 39.1 in. of rear leg room.
What is the rear leg room of the 2006 Ford Expedition?
The 2006 Ford Expedition has 38.7 in. of rear leg room.
What is the rear hip room of the 2006 Ford Expedition?
The 2006 Ford Expedition has 62.4 in. of rear hip room.
What is the rear shoulder room of the 2009 Ford Expedition?
The 2009 Ford Expedition has 63.7 in. of rear shoulder room.
What is the rear hip room of the 2011 Ford Expedition?
The 2011 Ford Expedition has 59.9 in. of rear hip room.
What is the rear shoulder room of the 2012 Ford Expedition?
The 2012 Ford Expedition has 63.7 in. of rear shoulder room.
What is the rear head room of the 2014 Ford Expedition?
The 2014 Ford Expedition has 39.8 in. of rear head room.
What is the rear hip room of the 2013 Ford Expedition?
The 2013 Ford Expedition has 59.9 in. of rear hip room.
