I would check for the following:

 - low coolant level
 - air in coolant lines
 - bad thermostat

--- On Sun, 26 Jan 1997 11:51:06 -0600  Robert Cronin <cronin@meol.mass.edu> wrote:

>Greetings, I'posting to the type 2 list as well as the vanagon one in 
>order to tap the minds of ALL the mechanical geniuses out there.  Sorrry 
>for wasting any bandwith on non-aircooled problems.
>Last week I had a problem in which my van was overheating while the 
>interior heater was not working. I assumed I had an ice blockage due to a 
>weak antifreeze/water blend. The van was defrosted in the garage and was 
>running alright afterwards.
>The past few days the van warms up with the temp gauge reading 1/4 - 1/2, 
>however the heater blows only cold air.  After driving about 5-10 min it 
>starts getting warmer, only to cool down shortly. 
>I never had a problem with the heater previously, in fact, after only a 
>few minutes of warming up, it usually blows nice and hot. anybody know 
>what the problem could be?
>
>TIA
>Regards
>Paul C
>82 diesel westy

-----------------End of Original Message-----------------

________________________________________________

  Michael Stocker <mdstockr@neo.lrun.com>
  North Canton, Ohio, USA     Time: 1:02:46 PM
  LiMBO / GASS                Date: 1/26/97
  1989 Audi 90 Quattro
  For sael: 1988 Mazda 929
  For sale: 1991 Acura Integra LS 3-dr w/37k mi
    Wanted: Nice low mileage VW Vanagon
________________________________________________