What is the maintenance rhyme for automotive air conditioning pressure gauges?
1 Answers
The maintenance rhyme for automotive air conditioning pressure gauges is: 1. Low pressure high, high pressure low—compressor needs replacement; 2. Both pressures high—requires exhaust or indicates a cooling issue; 3. Gauge needle shaking—system has moisture, evacuation must be more thorough; 4. Both pressures low—lack of refrigerant or system blockage. The meanings of the rhyme: 1. When the air conditioning pressure gauge detects that the system's low pressure is higher than normal while the high pressure is lower than normal, the fault is due to internal wear in the air conditioning pump leading to reduced efficiency, requiring compressor replacement; 2. When both high and low pressures are higher than normal, common faults include air in the system or overcharged refrigerant, necessitating re-evacuation and adding the correct amount of refrigerant; 3. If the pressure gauge needle continuously shakes during operation, the system must be re-evacuated for at least 15 minutes, and the dryer bottle should be replaced to thoroughly remove moisture from the system; 4. When both high and low pressures are low, it could indicate either a system blockage (where the blockage causes a noticeable temperature difference at the restriction point) or a refrigerant leak leading to insufficient refrigerant.
