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[SMD]

I noticed today when using the CC when I set the temp to say 23 degrees, the fan comes on a high setting (quite normal I guess) to reach the temp quickly but then fan speed remains high and temp gets quite uncomfortable i.e. exceeds chosen temp and keeps on blowing hot air. This is on both AUTO and ECO mode.

The last time I drove the car, it would reach the desired temp and the fan speed would automatically die down to maintain the temp.

[Daffy4895]

I had a similar problem with mine, would run at different speeds no matter what the fan speed was set too. Had to change the heating resistor located under the glove box to fix the issue.

[SMD]

Is it easy to get to and replace? (if that is the problem)

[Daffy4895]

It took me about an hour, you have to remove the glove box and airbag cover, there is an how to some where but I can't locate it at the moment. Got a resistor off eBay for £45, they seem to go for anything between £45 and £100

[RobG]

Up under pass. glovebox to the right of the heater blower motor. Held in by two clips. Don`t snap the clips when trying to remove. Can be done with glovebox in situ but fiddly.
If your`s is knackered, got one here if needed

[RobG]

Looks like this

[fiend61]

i would have thought that if the resistor had gone it would only blow on highest speed, have you tried testing the fan speed by using the manual speed control ?
if this works then the resistor is ok, i am not sure but think there is a temp sensor in the car which if goosed would cause your problem
somebody will be along soon with more info 

[Daffy4895]

Good point Fiend, mine hand gone nuts on auto and manual, which is why I swapped out the resistor

[Proz]

Is your outside temp sensor working properly ?
I belive these can cause it to go funny if its not  :-/

[RobG]

Is your outside temp sensor working properly ?
I belive these can cause it to go funny if its not  :-/

.......also the dual-zone sun sensor on the dash

[SMD]

The fan speed can be manually adjusted and it does blow on lower settings so the resistor is ruled out. Re: outside temp, this morning I remember it was between 7-10 degrees which seems about right. I use CC with only the drivers side on, passenger side stays off if that makes a difference.

[fiend61]

yup imo if fan speeds work on manual the resistor is fine
outside temp sensor seems to be working (better to recheck tho just to be sure it does change)

.......also the dual-zone sun sensor on the dash 

as robg said this can interfere with climate aswell but as for testing  it sorry but not a clue  :-/
if i am not mistaken isnt there a reset procedure for the climate control ? i think it is off and auto buttons pressed together  :-/
someone will tell you shortly 

[SMD]

Is there a way to test the sensors are working?

[Andy H]

Is there a way to test the sensors are working?

I think Tech2 can take live readings.

I don't know if any generic readers can do the same (I doubt it  )

[SMD]

Thanks Andy. I'll try the reset procedure first before anything else. Couldnt find the reset procedure in the manual, can anyone confirm its as fiend61 says?

Out of curiosity is there an ideal setting for the CC? This is my first car with climate and I still havent got to grips with it. I understand ECO is basically heating without dehumidifying but what does AUTO do? If neither AUTO and ECO are selected is the system still dehumidifying the air? What does AUTO and ECO do when they are both on?

Sorry for 101 questions, I must sound like a right numpty.