Air Con: Internal compartment sensor

[NMB]

All,

So I have reduced my fault list on VIDA from 11 amber/red errors in July down to just 2!!! I have an absolute bee in my bonnet to sort these final two problems so I have a perfectly working 2007 MY Volvo XC90 D5 AWD (185 bhp) on 175,000 miles.

Many of you will probably say "don't bother they are minor" but I want the car in tip-top shape as I have my three children in her daily, I'm a single parent, and I'll be keeping her for the next few years for sure.

I feel if I look after her then she will look after me

So to my question:

1) My internal temperature sensor is not working and reports a low signal. I know that I need the battery off, then the central control module off for the centre consul / CCM and I also understand that the small fan unit sticking out of the back will be the faulty part. so my question is that once removed do I:

1) Check and clean it and hope that it is gunked up with dust and crap and will start to work? ( I don't this it will based on the fault code).
2) Buy a complete 2nd hand CCM replacement unit and hope the temperature sensor works?
3) Replace the temperature sensor on the back of the unit? (is this possible?)

I want the heating system to work to keep a sensible temperature in the car so help and comments welcomed, please.

Also, if you are interested, I also have the external sensor not working as the other fault and I have a replacement part ready to fit, I just need to take the scuttle off and replace this.

My only other jobs really are to replace the 2 front Flexi brake hoses as they have been advised on the last 2 MOT's that they are corroded. So while I replace these I will also push through new DOT5 brake fluid on all corners of the car to give me a fresh pedal.

Thanks as always for your time reading and replies.

Nigel.

[SwissXC90]

Most likely the little thermistor located behind the vent has been broken by some over eager cleaner thinking it was a bit of dirt. The thermistor is the temperature sensor.

Get a replacement CCM from a wrecker, with an intact thermistor, and replace yours.

Of course, you should clean out any dust and dirt from the vents and fans whilst you have your’s apart...