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Discussion Starter · #1 ·
The AC compressor is controlled by the stock ECU.
I no longer have a stock ECU.
Any ideas on how to run my AC compressor. I have located the trigger wire.
I currently have it connected to a cycle timer. I cycle the compressor 30 seconds on, 30 seconds off. I can adjust the time interval if needed.

Any ideas? Will my cycle work?

It blows nice and cold but I don't want to damage my AC system.
 

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Thanks Michael.
I started to look at the Trinary Switch. I wasn't 100 percent sure if the Trinary
is what I needed to connect to.
you are on the right track... the AC button passes ground to the ECU via the trinary switch. it looks like the ground is passed thru to the ECU if the pressure is not low or high (need to confrim that on a working elise). the ECU then activates the compressor relay by also sending a ground.

in theory it might be as simple hooking the two together through an ignition activated relay. i dont know what the ECU does with the signals though... there might be some programmed logic in the ECU that also controls when the compressor is or is not activated like based on temperature,etc.
 

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i dont know what the ECU does with the signals though... there might be some programmed logic in the ECU that also controls when the compressor is or is not activated like based on temperature,etc.
More likely, it's simply that the ECU turns off the AC compressor whey you give it wide open throttle - a lot of cars do this.
 

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For sure temp. is not the only control to turn on or off the compressor. We are in HK and we need as much A/C as possible, but with no reason the A/C will switch off the compressor, and I am also wonder how to keep it on full time.
 

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The compressor can not run all the time because it will freeze up. It is cycled by the Evaporator thermostat the purpose of which is to turn off the compressor just before it freezes. Have you done any of these mods http://www.lotustalk.com/forums/f92/improved-c-heating-system-71031/
Michael
For sure temp. is not the only control to turn on or off the compressor. We are in HK and we need as much A/C as possible, but with no reason the A/C will switch off the compressor, and I am also wonder how to keep it on full time.
 
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