My 87 vanagon has been using  coolant for the past two
years.   On average about a cup every 1000 miles.   It
will use more when I am driving it in the mountains
under a heavy load and tends to run hotter with the
high speed fan kicking on and off .     When it is
running hotter but never overheating (never has)I can
smell the slightest whiff of antifreeze coming from
the front.   I have looked everywhere for some
evidence of coolant loss but I am unable to find
any.(front and rear heaters, radiators,engine)   The
coolant gets replaced from the very back tank and
there is no evidence that it boils back into the
recovery tank or ever boils in the tank with the blue
cap.   I have replaced the thermostat and the blue cap
and bled the system.   I am concerned that the coolant
is going out the tail pipe but I see no evidence of
this?
What is my future here.   How long does it take to
before I have this situation clarified and will it
strand me somewhere?   Any voice of experience is
appreciated.  gary

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