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Thread: A/C Without a Computer

  1. #1
    Junior Member quick86silver's Avatar
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    Default A/C Without a Computer

    Has anyone taken their car off the computer and kept the A/C?

    Can this be done by simple rewiring or is the computer needed?
    I am considering a 455 for my 86 and want to keep the A/C since I don't have t-tops or a moonroof.
    Vince

    86 Salon - 455 powered

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    I heard if you get an A/C setup from a Diesel car you can run it without a computer, the Diesels don't use a computer for the A/C and are great for the computerless kickpanels and A/C setups that run without the ECM. I have the schematic somewhere on how the wiring is setup but I have to do some digging.

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    Junior Member quick86silver's Avatar
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    I think it would be too much trouble trying to find a Diesel car, those have to be very rare!
    Keep me posted on those schematics.
    Vince

    86 Salon - 455 powered

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    Administrator 88hurstolds's Avatar
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    I have a Diesel car that I am parting out, I can disseminate the A/C workings here when I finally get time to part the car out. However I can confirm there is no computer in the kick panel and there is no shutoff switch on the gas pedal.

    I do know for cars with a computer you have to keep the A/C system hooked up to the computer. The A/C system for VIN 9 cars use the computer to disengage the compressor at full throttle and do use the computer for sensing refrigerent pressure I believe.

    If you are cleaning up the engine bay of a g-body to get rid of all those pesky emissions components and keep the A/C you need to be sure that the relay wires and compressor wires are still there and make sure the a red wire that connects to the A/C / Emissions harness from the drivers side harness, that connects to the fuse box/battery, remains intact when disconnecting this harness at the rear of the engine. As for the rest of the wiring just make sure to follow the wires back and cut near the firewall or tuck and wrap them up to hide below the heater box so they can be reused just incase. The MAP sensor, TPS, mixture solinoid, temp sensor, knock sensor, AIR pump relays and such can all be tucked away.
    Last edited by 88hurstolds; 07-02-2008 at 01:01 PM.
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    I installed a 455 in my olds and you do not need the computer. It can be wired to work without one. Not hard but if you have a manual it even easier. If i recall right i just had to elimanate a relay by bypassing it.

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    Junior Member quick86silver's Avatar
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    Quote Originally Posted by 85olds4spd View Post
    I installed a 455 in my olds and you do not need the computer. It can be wired to work without one. Not hard but if you have a manual it even easier. If i recall right i just had to elimanate a relay by bypassing it.
    Interesting, I'll have to try this out on my 86.
    Vince

    86 Salon - 455 powered

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    Found this in my manual. When you have the a/c on you should have power to pressure switch (lite green wire). then pressure switch to compressor (dark green wire). Make sure the black from compressor is grounded. Also found out that for the W40 option a cutout switch is installed in the lite green wire from control head to pressure switch. I am now thinking of rigging a switch at my gas pedal to cut the a/c out at full throttle.
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    Junior Member quick86silver's Avatar
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    Very nice!
    Vince

    86 Salon - 455 powered

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    Was just wondering if you got your ac working yet and you'll love having a 455 under the hood.

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    Junior Member quick86silver's Avatar
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    A/C is up and working with some slight bracket modification to the main block bracket and jumping of the relay.
    And I love my 455
    Vince

    86 Salon - 455 powered

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    Will this work on the W40 hurst/olds cars? and where can I find these wires at

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    Administrator 88hurstolds's Avatar
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    Quote Originally Posted by 90hurst/oldsguy View Post
    Will this work on the W40 hurst/olds cars? and where can I find these wires at
    Yes.
    Engine bay, follow the directions on the wire schematic posted above.
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