Chrysler Grand Voyager

Hi, I have a 2003 Chrysler Grand Voyager 2.5CRD LX (UK Model).

Over the past few weeks the front blower has started playing up, intermittently. Sometimes it will come on straightaway when I switch the heating/cooling on. But at other times no air is blown at all. When this happens if I leave it turned on, it may sometimes spring into action or may remain dead.

I had the car serviced yesterday (44.400miles) by a Chrysler main dealer in Southampton, UK, but they could find no faults having checked the wiring. Typically it decided to work properly during the service, but when I took the vehicle from the garage the problem started again! Any ideas what may be the cause?
December 22, 2006.

Blower motor most likley. Bang on the dash or the housing when it won't work and see if it starts.
Blower motor resistor would be my next guess.