308 QV Air Conditioning Cut Off | FerrariChat
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308 QV Air Conditioning Cut Off

Discussion in '308/328' started by blu308qv, Jul 9, 2024.

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  1. blu308qv

    blu308qv Formula Junior

    Nov 12, 2008
    318
    Florida
    #1 blu308qv, Jul 9, 2024
    Yesterday I was driving my 308 QV mid day in the South Florida heat. The A/C on my car blows very cold. It worked fantastically for a 30 min drive. When I got home I left the car in the drive way idling while I moved another car to put it in the garage. It was idling for about 4-5 minutes. When I got back in the car to drive it into the garage, the A/C was blowing hot air. The oil temp and water temp were good, around 90 degrees. I turned off the A/C and back on, still hot air only. This morning, I started it up and did a quick 10 minute drive. The A/C was again blowing ice cold, no problem for the entire ride.

    Does the compressor have an auto-shut off if it overheats? Anyone have anything to share on this?
     
  2. JohnnyS

    JohnnyS F1 World Champ
    Owner Silver Subscribed

    Oct 19, 2006
    15,280
    Illinois
    Full Name:
    John
    #2 JohnnyS, Jul 9, 2024
    My guess is your freon is just a bit low. If low, the system can build enough pressure on the high side to condense the freon to a liquid at higher rpms. You will get much better cooling when the freon goes from a liquid to a gas in in the evaporator core. At idle, lower rpm, the freon isn't getting condensed to a liquid and so the cooling is poor because you are going from a somewhat higher pressure warm gas to a lower pressure gas. Poor cooling will result. If the freon pressure is too low, there is a pressure switch that will prevent the compressor from operating.
     
  3. Sergio Tavares

    Sergio Tavares Formula 3

    Nov 15, 2018
    1,308
    Full Name:
    Sergio Tavares
    #3 Sergio Tavares, Jul 10, 2024
    More details please
    any pressure measurements would define this problems
     

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