roundrocktom wrote:Interesting.... other thought is to use a small microcontroller to "mimic" the functions of the eccs system with regard to the A/C.
I just realized there is a good solution to your S14 AC problem. You may not like it because it will put a Honda part in your car, but......In the 86-89 Honda Accord with carbueration (sp, i hate carbs) Honda used a seperate AC control module. I know this module very well because I had to troubleshoot my old Accord AC. It is a small plastic box with a 14 or so pin connector on it. On that connector you will find +12V, GND, sig from overpressure, sig from underpressure, tach sig (oops, 4 banger...but may work anyway) sig from evaporator mounted temp switch, on/off sig from dash mounted AC switch, output to AC relay, output to IACV, and maybe I forgot one or two. The point is, this is a stand alone AC system controller, because the carb Accord used a emissions controller and not a ECU, and the Accord was usually sold without AC back in those days, Honda used a stand alone controller. It will cover all the basics of AC system function. It will provide overpressure, underpressure, high RPM cutout and 33F switching for the evaporator. It will even control a IACV. The AC clutch and IACV should be controlled thru a seperate relay, however.This is what I would do if I had a S14.Good Luck