I have a video, but need to go through the motions of putting it on YouTube.

My 2011 ac cycles off and on. I read a bit on short cycle, but its every 9 seconds it turns off and then on and repeat. I'd consider that rapidly, or is it literally on off on off?

 

Typically, that indicates low refrigerant. But, I'm not sure with our trucks, lucky haven't had to find out. I've had other vehicles in the past that low refrigerant would cause the compressor to cycle on/off.

 

That could be considered short cycling by some, but depending on the environment you're in there may be nothing wrong. What's more important than the fact that the compressor is cycling quickly is the reason that it's cycling. If the compressor is being switched off because your evaporator temperature is getting too low, that's not an issue and your A/C should be blowing cold; however, it is worth mentioning that evaporator temperature sensors can fail or read inaccurately. Restricted airflow from dirt and debris build up on the evaporator can also cause low evaporator temps or inaccurate evaporator temp sensor readings and poor A/C performance. If your evaporator temp sensor getting cold enough to switch of the compressor but your vent temps feel warm or just cool at best, then this is something worth looking into.

If the A/C is cycling because of excessively low system pressure, excessively high system pressure, or excessively high coolant temperature these are all problems worth investigating.

 

Any idea what the lowest outlet temperature that can be obtained?

My completely stock system could cycle between 44 to 50 degrees once operating for three to four minutes. After running for 10 plus minutes I could get barely into 42 degree range at the lowest point before the compressor cycled. I added pipe insulation to the evaporator to compressor suction line. Its the bigger of the two lines that parallel themselves by the battery, up to the top of the passenger fender and going back to the firewall. Additionally I added a 1M ohmpotentiometer that as adjusted measures 411k ohms across the evap sensor circuit behind the glove box. Now after 10 minutes I can get 39 and tap into the very high 38 degrees outlet temperature on occasion. Its really night a day what a few degrees of outlet temperature feels like in the cabin.