Faulty heater fan on a Zafira. Any ideas what it could be?

I recently bought a 2008 Vauxhall Zafira and I have already encountered a problem. On several occasions I have switched the fan heater on but no matter which fan speed I select it does nothing. This has happened when the windscreen condensated while driving which became very damgerous.

It have had the resistor pack replaced but this has made no difference. I also had to have a diagnostic done at a Vauxhall dealer for a seperate problem and there was no record of a faulty fan heater. I have seached the forums and I can't find anything about this subject. I was hoping you had any suggestions.

Asked on 15 April 2013 by Olly S

Answered by Honest John
The problem is usually the switch itself. Quite common.
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