For a while now my air con has been worsening. First of all their was a whirrring noise in the system - sounded like it was where I presume the air con unit is housed (passenger side under air bag area). This would be ok for a bit then sound again on and off for around 6 months. Of late however no.4 on the dial will only work and as it's the stongest it can make an awful unnatural din of whirring as though the car is about to take off (joking a bit). This lack of control on heating and cooling especially in the upcoming months is really annoying.
Would this be an easy fix or should I reluctantly take it to an auto electrician and stump up the cash. I have a rear windscreen wiper fault and a relay light fault inside the motor that he/she could review at the same time.
Thanks in advance. Any knowledge imparted I would be grateful of as I'm a bit of a dunce when it comes to motor vehicles.