how many miles on the car? and how is the head gasket status? Mine was losing antifreeze while sitting overnight nosed down in my driveway. After driving a little the hot water start moving trough heater core and gave me heat
I was loosing about a 1/2 pint overnight and it was enough to get some air into the heater core.

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New Addition to the family
2013 Passat TDI 5Miles
2004 E500 4MATIC Wagon 95k
1996 E300 Diesel 173k Sold
1993 300E 2.8 230k Sold
1994 E320 White Wagon 373K Sold
Still dreaming about ....500E


Radu Negru