2012 Fiat 500c only blowing hot air when temperature adjusted

Asked by May 03, 2019 at 07:51 AM about the 2012 FIAT 500 Lounge Convertible

Question type: Maintenance & Repair

Recently the weather has started warming up and I noticed when adjusting
the temperature I only have hot air blowing out all vents.  This occurs even
when selecting AC.  I suspect it could be the door that would blend outside
or AC air so perhaps a faulty actuator.  I have not heard any sounds that
would indicate an issue, just hot air.  I checked the coolant level and that
seems okay.  I did notice also that the temperature gauge for the engine is
slightly higher than I think I have seen in the past ( gauge rises to
approximately half way and I think it was one bar lower previously )   I will
hunt for the door actuator as I can't find anything online that shows this fix
exactly but hoping it is simple enough.  I did change the cabin filter last fall
so not sure if I did something when changing that out.

1 Answer

62,575

The ductwork has blend doors that move to get the temperature to the vent where you want it. The blend door that throttles hot/cold is sticking because the door actuator is defective. You may have noticed a tapping sound under the dash from a defective actuator. Try a spray lubricant on the actuator, or remove it to see if there's a broken sprocket. Might need replacing. It's not a difficult fix.

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