my car's ac blows cold air in the morning but warm or hot air when its hot or hummid outside. why?

every morning the car ac feels cool but in the afternoon after work when it hot 100+ outside it blows warm air. what could cause this?

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  • 9 years ago
    Favorite Answer

    Most likely you are low on refrigerant. high pressure liquid refrigerant is circulated to the evaporator in the passenger compartment. When you turn your a/c on the blower motor(fan)blows the warm air from the inside of your vehicle across the fins of the evaporator. What happens is, the liquid refrigerant boils and in turns into a vapor as it absorbs the heat. You may have seen your car dripping water on the ground with your AC on. It is coming from a drain tube from your evaporator and is perfectly normal. Common sense will tell you,with an increase in temperature the effectiveness of your air conditioning will be reduced drastically if you are low on R134A. R12(ie:freon) is no longer used due to its harmful effect on the environment

  • 3 years ago

    Ac Blows Warm Air

  • 9 years ago

    Because in the morning the air id colder and their for when you turn the AC on the air will be cold. And when it's hot it makes the AC air hot. Try switch the air flow system from outside to inside. It should work a bit better :)

  • 4 years ago

    This Site Might Help You.

    RE:

    my car's ac blows cold air in the morning but warm or hot air when its hot or hummid outside. why?

    every morning the car ac feels cool but in the afternoon after work when it hot 100+ outside it blows warm air. what could cause this?

    Source(s): car 39 ac blows cold air morning warm hot air hot hummid why: https://tinyurl.im/10DnH
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  • 9 years ago

    You need to find out if the A/C is bad, or if it is a temperature blend door problem in the ducting.

    Get it running with the A/C on and check the tube going to the firewall from the compressor. If it is cold and the air coming out isn't, the A/C is working, pointing to the blend door.

    If it isn't cold, then you should have it looked at.

  • 9 years ago

    You have to probably recharge the AC fluid.... not freon anymore, but whatever they are using now.

    When cold outside, the air will be cold, naturally. In the mornings, the outside air is cool, so what little bit you have in your AC will be cooler...but with the heated air, it isn't enough.

    Get it recharged.

  • Anonymous
    9 years ago

    In the morning, it is maybe 70 F. Your car has been off all night, your coolant is at ambient temperature, thus it blows air that feels colder. Now your car has time to warm up on your commute, the temperature of the coolant reaches somewhere around 200 F. Coolant is good at retaining heat when stationary. so, when you turn on your air when you go to drive home, your coolant is still warm or at least at ambient temp (100 F min). there fore, the air feels hot

  • 3 years ago

    Well its obvious your car hates you. you ever think about giving your car a little attention once in awhile like a wash or top off the oll. Just a little something that says I love you and and thank you for letting my fat **** smash your seat for all these years

    Source(s): The Rockford Files when James Garner and his car got a divorce.
  • Pete M
    Lv 7
    9 years ago

    Your A/C needs to be serviced.

    To properly service an A/C system, it's first necessary to recover the coolant remaining in the system (if applicable).

    Finding and repairing the leak is the next step, then evacuate the system to remove all moisture.

    Now is the time to add the proper amount of refrigerant and oil to the system.

    Without a doubt, the best method is to take your vehicle to an independent shop and have a certified A/C technician service your system.

    He will have all the tools, equipment and training to get the job done right the first time without causing damage to your system.

    A/C systems are really not user friendly when it comes to DIY repairs since they require specialized tools, equipment and training to do the job properly the first time, without causing damage.

    Don't waste your money on those recharge kits you can buy in auto parts stores as they don't deal with the primary problem.

    The primary problem is that A/C is a closed system.

    If your system needs recharged, it’s because there's a leak. The leak must be fixed before recharging the system or it's pointless.

  • 9 years ago

    ac needs charging-coolant

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