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Discussion Starter #1
Hi ive looked through a few posts about GT climate control problems but apart from people suggesting a reset which doesnt seem to resolve the issue in most cases i cant find any other possible causes . I havent tried a battery lead reset and it may cure the problem but id like to know roughly what the problem IS before i cure it ! 9 or attempt to ! )

When i start the car (2006 JTD) in the morning and its cold seems to take forever to blow hot air through vents .
then its too hot so i lower the temp to 16.5 and its still blowing hot air . if i turn to LO and turn off AC snowflake button it will blow cold ambient air . if i raise temp to 16.5 its back to boiling hot again ! :confused:

any ideas please .

thanks and Happy New year to all Alfa owners !! :D
 

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Disconnect the negative battery terminal for at least 10 minutes, reconnect and DO NOT start the car or even put the key in the ignition for at least 5 to ten minutes, this should hopefully work.
 

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Discussion Starter #5
Well as I thought would happen (as in my initial post) the reset only lasted a day and its back to being the same again . :(
Ive read this in other topics where the reset seems to work only for a limited time .

there MUST be a reason WHY the Climate control is blowing hot air at 16.5 degrees ....if anybody has a clue please let le know . cheers
 

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there MUST be a reason WHY the Climate control is blowing hot air at 16.5 degrees ....if anybody has a clue please let le know . cheers
Because like all Climate Control it is a thermostatically regulated system. If the temperature being sensed in the car (the temp sensor is behind the little grille by the middle dial) is less than the set temperature then it will blow warm air to bring the temperature to the setpoint.

It may be possible that you have a faulty temperature sensor. You need to measure the temperature in the car with a thermometer and adjust the Climate Control temperature and see if it changes. Or try hoovering the grille - not sure if it's the same in 147s & GTs but 166s have a small fan sucking air into the grille over the temp sensor and the grille can get clogged up.
 

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my 156 does the same, mega hot at 16.5.
now doing reset, i always wondered what those little vents were for,
 

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Have you sorted your problem out? My 156 is still blowing hot air, even though it has a new climate control panel? Please can someone help us!
 

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What is the cabin temperature when it blows hot? If it's more than a degree or two below 16.5 then of course it's going to blow hot air! It's trying to achieve the temperature you set it to. Also, if you're keep adjusting it, then there's no surprise it seems erratic -you're defeating the low pass filter built into the PID control.

Get a digital thermometer for a fiver or so. The cooking ones with a probe are useful for all sorts of things anyway. I'll bet you a pint now that it's blowing hot because the cabin is significantly lower than setpoint temperature.

Have some sympathy for that poor diesel, it does take appreciably longer to reach temperature. Personally, I keep mine on 16.5 first thing in the morning whatever. If you've got it up to the max while the system is cold, you're only sinking a bit more heat energy away from the engine anyway and prolonging the situation. Then, when it eventually comes up to temperature, you'll roast.

I always leave the blower in the rear on, directed upwards. A little bit of extra circulation does help maintain an even temperature in the cabin.
 

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In my last Alfa a 147 I would always set the temp at 19.5c, in this 156, 19.5c is just not comfortable and it simply just does not regulate air temp at all, there are so many people on this forum who have the same problem. It would be brill if someone can tell us what the fault actually is.
 

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I have same problem in my car (156 2.5 V6 2002). Have anyone solve this problem?
I have found many threads of the problem, but not a good answer to solve it.

Cheers from Finland! :thumbs:
 

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Ok, I check my car with MultiEcuScan and found, that when climate control goes wrong and starts blowing warm, the engine temperatur shows -12 celsius degrees. So that is the problem. Where I can found that engine temperature sensor, that climate control use?
 

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My GT Blackline did the same after having a new battery a couple of weeks ago. Luckily I was at my local Alfa specialist and they plugged in to the computer and looked at the air con settings two air conditioning actuators were showing faults. They did a reset on these and solved the problem in minutes. They said the low battery voltage confused the ecu and any number of random errors can appear. By the way new to this site so thanks for some great info hope this helps
 
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