The AC in my sons 2004 Eclipse was just not reliable. Came on, wouldn't come on. Gases perfect. Compressor clutch fine. Relays good. What the $#@ was wrong with it?
Turns out this car has an extra controller module inside, on top of the fan box system, called a "compressor clutch controller" Black, about 4 inches square, it determines IF the compressor clutch is allowed to engage. It has a flying 2 lead thermistor that snakes its way to just under the AC evaporator at the center of the dash at the very bottom where the water collects from the evaporator then spills inside the car (another story) The value of this thermistor at normal temps is documented NOWHERE. It should be about 1K+. Mine was 44K which told the module that the vent system was so cold, why bother turning on the clutch?
New (ok old one from ebay) module $20 came with thermistor & long lead. Easy to install. Fixed it right up. This solution was not mentioned on the web so perhaps it is rare. Just recently, this has been my luck.
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