For your front heater, besides checking or replacing the relay, you might test the blower switch in the dash heater control before taking out your heater (to get to the blower fan itself).  The dash switch is inexpensive, under $10, available from Bus Depot I think (I got one quickly from my local VW dealer).  It is a simple 3-position plus off switch that routes the current to the various resistors (or no resistor) which are located near (I think)the blower motor itself.   Probably can't open up the switch to spray it out, but it is fairly easy to get it out of the dash (under the heater controls cover plate where it clips in from the front).  See Bentley 97.116 (if you have it) for the wiring diagram and 80.14 for a picture of the heater with series resistance wiring to the fan motor.  You can get at all the relays easily (one screw out of the fuse box to drop it down to access the relays which mount above the fuses) but I don't see how you could get at the front blower motor without taking the dash out and the heater apart.

Jim Creech
87 Westy

  Woody, Your tip is was most timely. I am having problems with my heating system. Front heater:  Blower motor runs fine on "High", but on the other settings, the motor runs in fits and starts. Very erratic.  Is this symptom solid for a relay problem? And you say I can get to it somehow through the dash, without having to remove it. That would be terrific. 
  <snip>

  John Rodgers 
  88 GL Driver 

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