2005 Leaking antifreeze

[Js1961]

2005 Ford Explorer 185000 miles. I keep losing antifreeze, I've noticed the levels drop when using the heater or when just the vent is on. When the a/c is on the level remains full. There are no visible signs of leakage and the thermostat housing was changed last summer.

 

[Rick]

I moved your thread to our 2002 - 2005 subforum where the right folks should see it.

 

[drdoom]

Which engine, cherry?