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AC Wiring Assistance - 91 Camaro LS Swap/3rd gen HVAC

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Old 03-02-2018, 08:09 AM
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AC Wiring Assistance - 91 Camaro LS Swap/3rd gen HVAC
After searching a number of threads and did not find guidance around my specific configuration, although I am sure it exists. Feel free to point me in the right direction or post up the specifics.

I have a LS in my 91 Camaro and preserved all of the the factory HVAC components (wiring, relay, compressor, etc). My goal is to integrate this into the existing LS configuration.

Current components are:

            Looking for guidance on how exactly to functionally wire the HVAC.
            Attached Thumbnails AC Wiring Assistance - 91 Camaro LS Swap/3rd gen HVAC-img_3392.jpg   AC Wiring Assistance - 91 Camaro LS Swap/3rd gen HVAC-img_3393.jpg  
            Last edited by TKO500; 03-02-2018 at 08:19 AM.
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            Old 03-02-2018, 11:59 AM
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            Re: AC Wiring Assistance - 91 Camaro LS Swap/3rd gen HVAC
            Check out my wiring diagram for how mine is set up..

            https://www.thirdgen.org/forums/ltx-...-pcm-into.html
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            Old 03-03-2018, 11:43 AM
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            Re: AC Wiring Assistance - 91 Camaro LS Swap/3rd gen HVAC
            I have exactly the same setup. I bought another oval relay and put it on the extra relay mount next to the blower motor. Wire it like this:

            Note the purple doesnt HAVE to go to IAT. It's either a ground or 5v reference I cannot remember, nothing specific to the IAT

            I also ditched the low pressure switch on the dryer

            Last edited by kenney001; 03-03-2018 at 11:46 AM.
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            Old 03-09-2018, 11:15 PM
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            Re: AC Wiring Assistance - 91 Camaro LS Swap/3rd gen HVAC
            The diagram shows integrating the wiring with the PCM. I would prefer allow it to function as a standalone system and integrate the AC request wire only.

            Is this a possibility?
            Or am I forced to wire it as noted in the above diagram?
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            Old 03-10-2018, 12:33 AM
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            Re: AC Wiring Assistance - 91 Camaro LS Swap/3rd gen HVAC
            Depends if you want the PCM to bump the idle _and_ turn rad fans on.
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            Old 01-29-2020, 06:37 PM
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            Re: AC Wiring Assistance - 91 Camaro LS Swap/3rd gen HVAC
            Originally Posted by TKO500
            After searching a number of threads and did not find guidance around my specific configuration, although I am sure it exists. Feel free to point me in the right direction or post up the specifics.

            I have a LS in my 91 Camaro and preserved all of the the factory HVAC components (wiring, relay, compressor, etc). My goal is to integrate this into the existing LS configuration.

            Current components are:
            Looking for guidance on how exactly to functionally wire the HVAC.
            any luck on figuring out how to make the compressor work off of single wire
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            Old 01-29-2020, 07:32 PM
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            Re: AC Wiring Assistance - 91 Camaro LS Swap/3rd gen HVAC
            Originally Posted by eduardosac
            any luck on figuring out how to make the compressor work off of single wire
            Just leave it wired like the stock TPI if you want, then have the clutch command wire connected to the LS ECM so it knows the air is on
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