Low pressure switch is turning it off when it get down to 30. If the system was real low on freon you'll need to put a jumper wire in the low pressure switch connector to get the compressor to run enough to add freon. The switch is on the reciever/drier. Just take the connector off, make a jumper out of a paper clip and put it in the connector.
That was my thinking too after I posted and I did just that.
The compressor ran longer, but still only 10 secconds then it blew off the safety valve for a seconds and I removed the jumper.
So I bled off some into a empty 12 oz can and moved it to another vehicle, 3 times.
Now the initial run is @ 2 mins then it begines to cycle every 30 seconds or so.
I'm thinking it is the hi limit switch interupting the power, strangly though the low side pressure is @ 30
My hose does not connect to the high side so I have no reading there.
It had been cooling ok but yesterday was the first 80 degree day we had so I conected to the low side and though I'd top it up. Maybe I should have left well enough alone.
Btw my guages seems to read normal on other vehicles. In fact I have 2 and they both agree.
Could not be there is a circulating issue could there?