LESSON. 3

General maintenance	Preventive maintenance	Car maintenance
Save on fuel	Improve your engine performance	Replace tyre
Detect a brake problem	Detect a radiator problem	Detect an alignment problem
Detect an engine problem	Car do’s and don’ts	Car Paints

Car do's and don'ts - this section covers the basics of car maintenance like maintaining the refrigerant level

and cleaning the evaporator. A quick check, and quite a few of the problems that plagued you will be no more...

Do	Don’t
Clean condenser during normal service of the car Dirty and clogged condenser results in A/C tripping and less cooling.	Do not use A/C with fresh mode open. This will lead to mixing of outside air with cool air inside thereby reducing cooling effect.
Maintain proper refrigerant level. Less refrigerant results in less cooling. Excessive refrigerant results in less cooling.	Do not operate with A/C on. This will result in mixing of hot air with cool air.
Add at least 20 CC of DENSO-6 oil to the compressor during refrigerant charging. Adequate quality of compressor oil prevents poor pumping and premature wearing of internal components.	Do not operate A/C without refrigerant in the system. This will result in premature failure of compressor.
Clean evaporator properly to remove dust and foreign particles. Clogged evaporator results in less air flow and reduced cooling.	Do not leak check the A/C system with more than 20KG/CM2 pressure. Higher pressure may result in damage to A/C components.
Adjust fresh air and heater cable properly to close damper’s firmly. Unadjusted cable will result in mixing of hot air with cool air.	Do not leave A/C joints open. Moisture tends to enter the A/C system if the joints remain for a long time.
Refer to the owner’s manual on proper usage of A/C controls. Proper usage of A/C control will give optimum cooling.	Do not charge refrigerant in the A/C system without carrying out proper vacuum. Improper or no vacuuming of the A/C system results in less cooling conditions.
Adjust proper engine RPM. Less rpm will result in stalling of engine and less cooling.
Check coolant level and ensure proper engine tuning. This will prevent overheating of the engine.
Check position of accelerator cut off switch in 1000cc cars. Improper position of accelerator cut off switch will result in tripping.
Check proper belt tension. Loose belt will slip and overtight belt will result in noise and premature failure of magnetic clutch of the compressor.