Without knowing the high pressure side, it is not possible to pin point the exact fault.
Possible causes are :
a) If low pressure hose and check joint are cooler than around evaporator, the expansion valve is faulty.
B) If the suction pressure is lowered when condenser is cooled by water, you have excessive referigerant in system.
C) If high and low pressure equalized as soon as compressor is stopped, the compressor is faulty.
Sunday, June 17th, 2012 AT 6:14 PM