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  1. PumpMan

    A/C retrofit on a 90 3500

    Hi guys, Has anyone seen a write-up on retrofiting a complete A/C system into a non-A/C 88-90 truck? The mechanical system is easy, I'm just not sure what the easiest way is to hook up the controller. I would definitely swap out the entire HVAC system under the dash and all the accessory...
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