One problem with the blower motor being intermitant are the motor brushes. You will have to remove the blower motor and look at the brushes. Drop the passenger knee bolster. Unbolt the 3 bolts (IIRC) and take a look. If they are very short then either replace then (do a search on this), buy a new motor ($$$) or get a used one.

Dave

You need to do a search on this. This has een discussed quite a bit. The search will help you learn about the heater system and how to diagnos any problems. With the blower switch in auto It waits for some warmer water prior to starting. YOu can press the HI fan button and it shoudl come on imediately. Again do a search and learn about your system.

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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car