How to remove AC?
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This is a discussion on How to remove AC? within the Interior Mods forums, part of the Tech & Modifying & General Repairs category; I'm considering to remove the AC completly to save some weight. Anyone know how this should be done? I guess ...

  1. #1
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    How to remove AC?

    I'm considering to remove the AC completly to save some weight. Anyone know how this should be done?

    I guess I will remove the AC lines, ac pump. How will this affect the rest of the cars fan system?

    I belive there is a ecu that controles this because when you turn the heat\cold up at the windows the AC automaticly turns on. If I remove if how what will the affect be on this ecu?

    Anyone want to share their experiences?
    Silver -02 Impreza WRX

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  3. #2
    Registered User platano's Avatar
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    Well, as far as the control for the AC, I believe is switch controlled. Check out the following thread about how it works and disabling it :
    Disable automatic AC with Defogger

    I can't remember of the top of my head if the belt for the AC runs any other accessories. Give me a few minutes, I'll go outside and look at my car. (I luv my job , flexibility is teh win).

    I'm not sure if the ECU has any control on AC related things. I know some cars do adjust their Idle settings to compensate for the AC pull. I'm not sure if the WRX works the same way.
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    you do know you have to drain the freeon ect right? and make sure you use gauges cause its compressed that sh*t will mess you up//

  5. #4
    Registered User MidnightFLAT4's Avatar
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    I wouldnt do it... the weight is negligible, and its not going to cut your quarter mile times. focus on other things like learning to drive better. Get a race battery. Also, subaru's flat engine belt layout is kind of messy.

    This is a redneck mod,
    defrost and a/c are not on unless you select a/c or defrost, the pulley spins free until then.
    Plus, youll get pissed off when you cant get rid of the foggy condensation on the inside of your windows... the WHOLE car will stay like that until you roll the windows down..

    did i mention that girls/women wont be riding in your car on hot days
    03 MBP WRX Sedan
    STi RA gearset October 4th,STi Trans Mount
    Cobb AccessECU STG II 16.4psi. Bosal DP, Catless OEM UP, 205/55 ZR16 Futura Ultra Z's.

  6. #5
    Registered User Timdog1650's Avatar
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    Originally posted by MidnightFLAT4
    I wouldnt do it... the weight is negligible, and its not going to cut your quarter mile times. focus on other things like learning to drive better. Get a race battery. Also, subaru's flat engine belt layout is kind of messy.

    This is a redneck mod,
    defrost and a/c are not on unless you select a/c or defrost, the pulley spins free until then.
    Plus, youll get pissed off when you cant get rid of the foggy condensation on the inside of your windows... the WHOLE car will stay like that until you roll the windows down..

    did i mention that girls/women wont be riding in your car on hot days

    Rednecks = All WRC and rally cars

    Although I agree that it's a stupid thing to do if you want to just go faster, it is by no means a worthless mod if you're doing it for the right reasons. All weight reduction is important, in every respect, and Subaru wouldn't make the Spec C w/out an air conditioner if it didn't feel that it was a significant change. Get a roof vent and it will partially address the issue of heating/cooling to a degree where life will be more pleasant.

    As far as real benefits you can get from the AC removal, I'd say the most significant and practical is the weight cut. You can also reverse your intake manifold once you remove your AC, which will allow you to put a more direct flowing FMIC on and run significantly more efficient induction into your engine.

    The attached pic is a shot of the Subaru WRC engine, with the reversed intake manifold. I have heard of this being done on normal people's cars, and the benefits being very real and substantial.

  7. #6
    Registered User bdoug's Avatar
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    SCC removed the AC system from Project Si. It weighed about 30 lbs.

    Not worth the hassle IMHO, unless you are going to strip the entire car for drag or auto-X.

    Don't forget that draining the refrigerant takes special tools, special equipment, and a special license from the EPA.
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  8. #7
    Registered User Timdog1650's Avatar
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    Originally posted by bdoug

    Don't forget that draining the refrigerant takes special tools, special equipment, and a special license from the EPA.
    Right, probably the biggest deterent in my mind is the coolant situation.

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    Originally posted by Mr_Ginzo
    you do know you have to drain the freeon ect right? and make sure you use gauges cause its compressed that sh*t will mess you up//
    Yes, of course.. Thats no problem..
    Silver -02 Impreza WRX

  10. #9
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    Originally posted by MidnightFLAT4
    I wouldnt do it... the weight is negligible, and its not going to cut your quarter mile times. focus on other things like learning to drive better. Get a race battery. Also, subaru's flat engine belt layout is kind of messy.

    This is a redneck mod,
    defrost and a/c are not on unless you select a/c or defrost, the pulley spins free until then.
    Plus, youll get pissed off when you cant get rid of the foggy condensation on the inside of your windows... the WHOLE car will stay like that until you roll the windows down..

    did i mention that girls/women wont be riding in your car on hot days
    I'm not doing this to go faster in the straight, it would be easier to turn the boost up. I never do 1/4mile runs. However going fast in sharp turns are going to be better with less weight. Weight reduction is one of the most important things on every sportscar. There is a reason why many hardcore cars are made of carbonfibre parts...

    I have removed the spare wheel already, it weight like 20punds or something. I'm trying to save every pund I can.

    Less weight = less stress on every part of the car in every situation
    Less weight = bigger jumps
    Less weight = more fun

    I'm planning to change the hood and trunk for painted carbon fibre to save weight, I'll look into a race battery and see what weight I will save.. I'm thinking about removing the AC. I I only loose 10pund I guess it's not worth it, but if I can save like 30 I want to loose it as soon as possible... I never use it anyway...
    Silver -02 Impreza WRX

  11. #10
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    the dude lives in Norway...

    Been there a few times, no EPA (they are an American agency) and AC is not needed. Even with last summer's heat wave. Many cars and even buildings over there don't have AC in the first place.
    Jeff

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  13. #12
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    Sorry no news.. I think I will do the mod, but it's on hold for a while. Saving up for a new tranny and build engine block first. If or when I do the mod I'll let you know.. But I don't think it will be this year.
    Silver -02 Impreza WRX

  14. #13
    Registered User MidnightFLAT4's Avatar
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    ive talked to a few more people who have ditched A/C, majority of them get the roof scoops to pull in more cool air to the cab.
    Also if your looking for weight savings, try the following

    Race battery, removing panels, airbags, DRL (daytime running lamp harness, hood liner, foglights, passenger seat, carpeting in trunk, jack

    Most importantly, unsprung weight, go with some lightweight volk or rota rims

    force your passengers and yourself to go on a diet.

    And lastly Id ditch the A/C, but i love having icy crisp air at the control of my fingertips.
    03 MBP WRX Sedan
    STi RA gearset October 4th,STi Trans Mount
    Cobb AccessECU STG II 16.4psi. Bosal DP, Catless OEM UP, 205/55 ZR16 Futura Ultra Z's.

  15. #14
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    Originally posted by MidnightFLAT4
    ive talked to a few more people who have ditched A/C, majority of them get the roof scoops to pull in more cool air to the cab.
    Also if your looking for weight savings, try the following

    Race battery, removing panels, airbags, DRL (daytime running lamp harness, hood liner, foglights, passenger seat, carpeting in trunk, jack

    Most importantly, unsprung weight, go with some lightweight volk or rota rims

    force your passengers and yourself to go on a diet.

    And lastly Id ditch the A/C, but i love having icy crisp air at the control of my fingertips.
    Well I never use the ac anyway unless a rare few times.
    Lightweight rims are on order
    I never have more than one passanger when driving for fun..
    I don't weight much..
    Battery will be replaced, but has to have power enough for some basic stereo.
    jack and spare wheel are gone a loong time ago..
    Airbags are there for safety reasons.
    It's ilegal to not use DRL where I live.
    Seats and basic interior are staying because I don't want to transform the car style a race car look.
    I'm thinking of replacing hood trunk and doors with CF (and paint it silver like my car)
    I'm thinking of getting a rollcage that allow for use of passangers with removable cross pillars.

    I'm dreaming of a custom sti look daily driver with 400-500awhp including all interior and seats with my car pc project a small audio system and a rollcage dressed up with soft padding and with same color as the interior..

    Best of all I will get it, because it's my main hobby and I will not stop modding it untill I either wreck it or buy something else....


    You have to think possitive to get what you want I'm NOT saying it my car will be done this or next year, but some day LOL..
    Last edited by Roffa; 04-19-2004 at 07:14 AM.
    Silver -02 Impreza WRX

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