I have a Nissan Almera that I bought new in November 2003. It has done about 34,000 miles and been an excellent runner. About two months ago the heater fan stopped working on the first three speed settings, only working on number four.

I Googled it and discovered that it was a known problem requiring replacement of the heater resistor. I contacted the main Nissan dealership where I got it from. They replaced the resistor at a cost,which I paid, with a new one and it then worked perfectly on all speed settings until today.

I contacted the dealer again and they have said it might be the replacement resistor has failed in which case they will replace it. Or it could be the pollen filter that needs replacing or the heater motor. They said I should take the car back so they can have a look and decide what. I asked them for a quote if the motor had to be replaced. I nearly had a heart attack when they said that parts & labour would be £740! What do you think is causing the problem?