dash air

Ranger Smith wrote:
What should be done is the low pressure cutoff needs to be jumpered then start charging the system. That pressure guage will be different based on ambient temp. The screeching could be that the clutch engaged when pressure got up enough to turn it on and the compressor is frozen and that was belt screech

It was more like a grinding sound than a screeching sound.It would click like the cluch would engage and disengage real quickly about two or three times than it would grind.All this happened while holding down on the trigger on the can.When i would let go it would stop.I put some super ac sealer in before the second can i wonder if it sealed the service port?Althogh i was able to empty the second can into it without any change in pressure.