So scored a free freezer (big upright with draws) but it has a problem was told "you can only use it as a fridge it wont freeze"
So checked the heater wasn't staying on -all good
the fan goes and the heater timer seems O.K gauge on the suction confirmed low gas charge.
So to get a fitting on the suction I used a no heat required fitting
and added the dye through this plugged it in (still has low gas at this time) and will see if I can identify the leak -UV dye so purchased a cheap UV torch from the bay