5040BE AIR CONDITIONING SYSTEM OPERATING PRESSURE CHECK

HIGH PRESSURE	LOW PRESSURE	SYMPTOMS	POSSIBLE CAUSES	OPERATION
Normal	Normal	Mild temperature at vents	Excessive system oil level	Drain the climate control system. Clean the entire system, removing oil and residues, then recharge it.
Normal	Normal	Mild temperature at vents	Air/moisture in the system
High	High	Low pressure pipe colder than the evaporator	Expansion valve too open	Replace the expansion valve Op. 5040B30 EXPANSION VALVE (ORIFICE TUBE) - R+R
		Check if the high pressure drops by pouring water on the condenser	1) Excessive system coolant. 2) Condenser fan faulty 3) Condenser blocked	1) Drain the system and recharge it 2) Check/replace the condenser fan 3) Clean the condenser
		High and low pressure reach the same value as soon as the compressor deactivates and both vary when the compressor is operating	1) Exhaust valve faulty 2) Gaskets faulty	Replace the compressor Op. 5040A20 AIR CONDITIONING COMPRESSOR - R.R. INCLUDES CHECKING FLUID LEVEL AND TOPPING UP IF NECESSARY
Low	Low	Mild temperature at vents	Low level of coolant gas in the system caused by the presence of leaks	Restore the correct operation, then drain the system and recharge it.
Low	Low	Low pressure pipe and pipe end are colder than the evaporator.	Obstructions on the low pressure side	Repair/replace the pipes
High	Low	Ice on pipes	Obstructions in the air conditioning system	Restore correct operation
High	Low	Ice on evaporator	Evaporator blocked	Replace the evaporator Op. 5040C64 A/C EVAPORATOR - R+R