Checking the refrigerant pressure (Honda Civic 7)

See the "Checking Refrigerant Pressure" table.

Table. Checking the refrigerant pressure.

Malfunction	Symptoms	Possible cause of the malfunction	Troubleshooting methods.
Outlet pressure (high pressure line) above normal	After turning off the compressor, the pressure is about 196 kPa, then gradually decreases	Air in the air conditioning system	Remove refrigerant from the system, evacuate and recharge the air conditioning system
	When cooling the condenser with water, there are no bubbles in the service window	Excess refrigerant in the air conditioning system	Remove refrigerant from the system, evacuate and recharge the air conditioning system
	Not enough air passes through the condenser or no air passes through at all	-The radiator or condenser is clogged with dirt -The condenser fan or cooling system fan is faulty	-Remove dirt -Check voltage and fan speed -Check control circuit
	Condenser tubes become excessively hot	Low refrigerant pressure in the air conditioning system	-
Outlet pressure (high pressure line) below normal	Excessive amount of bubbles in the service window, the condenser is not hot	Lack of refrigerant in the air conditioning system	- Check the system for leaks - Charge the system
	-After the compressor is turned off, the pressure in the high and low pressure lines quickly equalizes -The pressure in the low pressure line is higher than normal	- Bypass valve malfunction - O-ring seal	Replace the compressor
	No cooling at the expansion valve outlet, low pressure line gauge shows vacuum	- Expansion valve malfunction - Moisture in the system	-Replace the expansion valve -Remove the refrigerant from the system, evacuate and charge the air conditioning system
Inlet pressure (low pressure line) below normal	Excessive amount of bubbles in the service window, the condenser is not hot	Lack of refrigerant in the air conditioning system	-Check the system for leaks -Charge the system
	No cooling at the expansion valve outlet, low pressure line tubes are warm, low pressure line gauge shows vacuum	- Expansion valve malfunction - Expansion valve freezing (moisture in the system)	-Replace the expansion valve -Remove the refrigerant from the system, evacuate and charge the air conditioning system
	- Low air temperature at the outlet - Weak air flow coming out of the deflectors	Evaporator freezing	- Check the air temperature sensor behind the evaporator
	Expansion valve freezing	Clogged expansion valve	Clean or replace the expansion valve
Inlet pressure (low pressure line) above normal	Low pressure line hoses are colder than the evaporator	The expansion valve has been open for too long	Repair or replace the expansion valve
	When the condenser is cooled by water, the pressure at the inlet decreases	Excess refrigerant in the air conditioning system	Remove refrigerant from the system, evacuate and recharge the air conditioning system
	After the compressor is turned off, the pressure in the high and low pressure lines quickly equalizes	-High pressure valve malfunction -High pressure valve clogged	Replace the compressor