Reply to "Orignal R12 A/C Pressures Readings?"

what i would do before adding any freon,is clamp off both heater hoses using pliers or clamps,at the engine.dont trust the heater valve for now.hot coolant flowing the heater core will change the guage reading and lead to a wrong diagnoses.put a thermometer in dash vent(i use a digital one)start car,a/c on max windows up doors closed.if you have guages hooked up good.next reach around to the compressor and feel the fittings/hoses,the larger one(suction side)should be getting colder and the other one (discharge side)warm to hot,too hot to touch shut it off and check condenser fan.did blocking off heater hoses change anything? it is ok to add freon in gas form, this means valve on supply up, turn it upside down,or shake it and you get liquid.add freon watching thermometer and guages.it should get colder each time you add a little and let it stablize. when/if the temp drops to around 50 degrees rotate the compressor control knob back alittle at a time and the compressor should start cycling off and on.then take clamps off heater hoses and see if that changes things.if cools good,compressor cycles, no abnormal noises,dont fix what aint broke