A/C cold on one side not the other - Alfa Romeo Forum
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(Post Link) post #1 of 13 Old 02-09-18 Thread Starter
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A/C cold on one side not the other

Noticed the other day that the aircon on the drivers side responds to the set temperature without any problem, but doesn't cool the passenger side even when the temperature is set to low.

Does the aircon have 2 separate gas systems or is it likely to be a sensor?

No wonder the wife has complained she was too warm when its been 31C outside. LOL

Last edited by napastar; 02-09-18 at 07:07.
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Refrigeration system is same for both sides.

I would say you have a problem with a flap or motor being stuck in heat position.
Have you got MES to plug in as I think you can actuate motors aswell as check for any logged faults
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i've had this occasionally, seemed to sort itself out. the left of the three vents blew warm, when the centre and right were icy cold.
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(Post Link) post #4 of 13 Old 04-09-18 Thread Starter
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Thanks for the advice. Unfortunately I haven't got MES but don't think a motor is stuck on hot as the air coming out on the passenger side isn't hot as such, just not chilled as it is on the drivers side
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Originally Posted by napastar View Post
Thanks for the advice. Unfortunately I haven't got MES but don't think a motor is stuck on hot as the air coming out on the passenger side isn't hot as such, just not chilled as it is on the drivers side
It’s a mix flap the motor controls so will adjust position to deliver the temp of air required relative to the setting. It can be stuck in any position so could be slightly open only blending a small amount of heat.
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Hi there.

Did you ever found the solution?
I’m having the same problem.
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Difficult to tell from remote, especially w/o any diagnostic trouble code(s) read out, but my guess is a faulty CU (heater panel).

This is a common issue on the 939 series, had it myself last summer (unfortunately 1 week before setting of to one of the hottest summers in France since decades).
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Need to know if it is a fan issue; Are the air flows the same on both sides? Or a temperature issue; Is the air temperature different on each side.

In either case the Fan and Aircon are single units but this will tell you which flaps are stuck or disconnected


Ps Unlikely to be the Climate Computer because you have one side working.
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Thanks Old Engineer.

The airflow certainly seems to be the same on both sides with the temperature being different. On the drivers side the actual temperature appears to correspond with the temp set but on the passenger side it doesn't appear to cool down to the same temp
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This might help you find your way around the heater...
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Originally Posted by napastar View Post
Thanks Old Engineer.

The airflow certainly seems to be the same on both sides with the temperature being different. On the drivers side the actual temperature appears to correspond with the temp set but on the passenger side it doesn't appear to cool down to the same temp
Mix flap broken/jammed or motor died for passenger side temp control.
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I'd also forgotten that there are two sensors and small fans in the lower left and right of the A/C control panel. They are checking the temperature of the cabin for each side. Are they both working? (or full of fluff)
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I'd also forgotten that there are two sensors and small fans in the lower left and right of the A/C control panel. They are checking the temperature of the cabin for each side. Are they both working? (or full of fluff)

They are free from dust/fluff but not sure how to confirm if they are working correctly. I have noticed that the temperature on the passenger side appears to respond correctly when you ask it to heat the cabin, just doesn't play ball when you ask it to cool below the outside ambient temp
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