Defrost turns on A/C?
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This is a discussion on Defrost turns on A/C? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; As the title says, does the A/C turn on with the defrost? I can't find an answer anywhere, thanks for ...

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    Registered User spoolinup's Avatar
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    Defrost turns on A/C?

    As the title says, does the A/C turn on with the defrost? I can't find an answer anywhere, thanks for helping a newb out

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    Registered User $lick Rick's Avatar
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    short answer: yes

    shorter answer: y

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    Moderator   Sasquatch's Avatar
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    Affirmative. Pretty much every car I have seen with A/C uses it along with the defroster.

    Moving to Maintenance, service, troubleshooting, and basic repair ...
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    Registered User xtrememotion's Avatar
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    Quote Originally Posted by $lick Rick View Post
    short answer: yes

    shorter answer: y

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    Registered User cavallino333's Avatar
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    Quote Originally Posted by $lick Rick View Post
    short answer: yes

    shorter answer: y
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    Quote Originally Posted by Integra96 View Post
    One day I hope to buy a car that is lubricated exclusively by pure manatee oil.

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    Good answer. Anyone know why? Didn't think so.

    It's because the AC compressor needs lubrication so it doesn't sieze later when you need it. The lubricant is in the refrigerant, so the only way to lube the compressor is to run it. Thus, most vehicles are designed to run the AC compressor when the defroster is on.
    My water heater has a blow off valve.

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    Registered User spoolinup's Avatar
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    well thank you, good to know!

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    Moderator   Sasquatch's Avatar
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    Quote Originally Posted by e-merlin View Post
    Good answer. Anyone know why? Didn't think so.

    It's because the AC compressor needs lubrication so it doesn't sieze later when you need it. The lubricant is in the refrigerant, so the only way to lube the compressor is to run it. Thus, most vehicles are designed to run the AC compressor when the defroster is on.
    A/C dries out the air inside a car. Dry air removes fog from the windows.
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    Registered User BlueBlurr's Avatar
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    Quote Originally Posted by 04.SPT.WRX View Post
    A/C dries out the air inside a car. Dry air removes fog from the windows.
    And that's why last night the car with 4 people inside was completely fogged!
    AC on nex time.

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    Registered User VVVV's Avatar
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    Anyone know how to stop it? Turn the key to On 40 times or something like that?

    It's just really annoying to have the AC on when it's 20 degrees and 10% humidity.

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    Registered User wrx wagone's Avatar
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    Quote Originally Posted by e-merlin View Post
    Good answer. Anyone know why? Didn't think so.

    It's because the AC compressor needs lubrication so it doesn't sieze later when you need it. The lubricant is in the refrigerant, so the only way to lube the compressor is to run it. Thus, most vehicles are designed to run the AC compressor when the defroster is on.
    Ummm... ok.

    Quote Originally Posted by 04.SPT.WRX View Post
    A/C dries out the air inside a car. Dry air removes fog from the windows.
    Exactly.
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    Registered User drummerboy's Avatar
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    Quote Originally Posted by VVVV View Post
    Anyone know how to stop it? Turn the key to On 40 times or something like that?

    It's just really annoying to have the AC on when it's 20 degrees and 10% humidity.
    How about just pressing the 'AC' button so it shuts off... works for me

    That whole "it turns on because it needs to lubricate" is wrong. Yes, it does need lubrication, but that's not why it turns on in the de-fog setting. The AC is a dehumidifier which takes away the fog and dries out the air like what 04.SPT.WRX said. You are supposed to let it run about once a month for proper lubrication though.
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  14. #13
    Registered User spoolinup's Avatar
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    I dont think my a/c light comes on with the defrost. I'll have to double check though.

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