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Go4DaMo

1st Gen Air Conditioning Component

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Anybody have the module that controls a/c flow/direction/cut off under throttle? Part is for my 1993 Lumina 3.4. I believe its behind the glove box in the dash and is in-line before the HVAC controls on the dash (already swapped that, but no luck). My car wont blow ac out the vents and isn't cutting off the ac when I'm under throttle. When I run it, the condensation incidentally pools up under the dash and has caused a pond on the drivers floorboard!

 

 

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The AC disable under load is an ECU command/function, not a separate module.  You can read the status of the AC through the ECU and its ALDL data stream (ie: the 8192 baud setup on your 1993), so it must be provisioned by and through the ECU.  Although quite frankly, the AC draws so little horsepower on these cars that it really wouldn't matter if that function wasn't working properly.  I've never heard of the cut-out being a problem though.  And because the V5 AC compressor in these cars is variable vanes, the relay doesn't tend to cycle that much.  Unlike my Honda, with a fixed displacement compressor, in which the ECU is constantly hammering on the relay to turn it on and off (to the point of breaking the relay!).

Alternatively, your AC compressor system is probably working properly and cutting out under load, *but* you have a vacuum leak or bad vacuum check valve.  Or a very worn engine or leaky intake that can't pull any vacuum.  

As for the wetness on the floor, get underneath  (on jackstands or a lift) and clean out the drain.  Dirt and grime will mix with the water and occlude the drain.  You might have to get in there with a knife and cut a larger drain hole. 

Edited by pitzel

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