SOURCE: Adding AC to my 1990 Dodge D150
good evening and welcome to fixya
adding ac to your dodge is kind of complicated. are you going to be doing the job or are you contracting it out? there are a few ways to go about doing this: one is you can hunt down another d150 that came from the factory with a/c and use all the parts from it. the second is you can look at purchasing an aftermarket all in one ac unit, sometimes you must do a bit of modifications to install this unit. the third is the most expensive but all new, you can go to your local chrysler dealer and ask for the schematic of the ac system for your vehicle and tell them what you want to do and they will give you a parts list, this list will include a new radiator to accomadate the a/c condenser. the major parts you will need are the condenser, switch panel, compressor and all brackets to hook up the compressor, the ac box under the dash the has the evap coil in it, you will need a set of lines and accumulator, pressure switchs high and low, expansion block, freeze switch, and possibly you will have to change the pulley setup on the front of the engine to accomdate the new belt for the compressor. this is a good starting point of the items that are required. hope this helps good luck to you.
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