Originally Posted by black-n-blue
Yes that was the first thing i did. The gauge on the can showed it being overcharged
the gauge on the can means nothing unless the compressor is engaged.
the can is a "low" side charge type, if the compressor is not engaged then its going to read high.
this is what you do, turn the ac on inside the truck, then unplug the low side pressure sensor, then use a small wire and jump the terminals on the plug. at this point the compressor should engage. if it does then you need to recharge the system as it is low.