To me, low pressures on both sides feel like low charge. 
But knowing it's ES12 in a leaky system, my first thought would be that the 
propane is mostly gone and you're trying to cool the car on isobutane. 
You might read some Cathyisms and slowly add propane until the vent temps drop 
and the low side pressure goes up. 
http://formicapeak.com/~jimc/cwair.html
http://formicapeak.com/~jimc/efair.html
Mitch.

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