My heat is acting up and I would appreciate some help/advice - I noticed this morning that it wasn't warming up even though the coolant was coming up to temp. The fan runs, but the air coming from the vents is not warm. If I turn off the ACC for a moment then turn it back on, the heat works temporarily - but only for a few minutes, then the air from the vents goes back cold.

It seems like the heat is working, just not making it into the passenger compartment. Any thoughts?
Thanks!

__________________
Autos:
1991 350SD 276,000 miles
2001 VW Beetle TDI 115,000 miles

Horns:
1955 Selmer Mark VI Alto (55,xxx)
1958 Selmer Mark VI Tenor (85,xxx)
1964 Selmer Mark VI Tenor (125,xxx)
1967 King Super-20 Tenor (430,xxx)
2002 Selmer Series III Soprano

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