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At Alfa Romeo Donnini Melbourne
Frank Donnini is Fully Accredited & Licensed ARCTICK registered business licensed to do Car Air Conditioning Service and Repairs.We offer car air conditioning services with fully qualified air condition Mechanic specialising in car air conditioning recharge (re -gasing), servicing, car air conditioning parts fitting, and repair of car.
We are Located in 1/31 Onslow Ave. Campbellfield Near Gowrie Railway Station –(Glenroy ) & Keon Station Thomastown.
Is your Air Conditioner Cooling 100%?
If not it has most likely lost Refrigerant Gas
Cool Auto Air Condition Service
The Air Conditioner is not always included in a ‘standard’ or log book service.
If however your Air Conditioning has stopped
cooling it has most likely lost gas and must be leak tested and repaired before Re-Gase.
You may not be aware that over 10% of air-con gas permeates from the air-con system every year, which means that it may not work as well as it should. This is why car manufacturers recommend your Air-Con system is recharged with gas and lubricant every 2 years. This service is not part of routine vehicle servicing, so if your vehicle is more than 2 years old it’s probably due a recharge.
During the hotter summer months motorists use the Air-Con system more; however your system is also useful in winter. Air-Con systems create dry warm air rather than the normal humid air from outside and this de-mists your car windscreen more quickly.
- Running the system at least weekly in non-summer months to keep gas and oil circulating through the system which helps extend the life of seals in the system
- Servicing the system annually and replacing the receiver dryer every 2 years
- Ensuring the drive belt is adjusted and in good condition.
To keep your Air-Con system fully charged all year, why not call in to Frank Donnini Mechanical Repairs and have your vehicle’s air conditioning system recharged with gas and lubricant today.
Leak/s of refrigerant can occur from pipe joints as a result of vibration, from ageing rubber hoses and ‘O’ ring seals, as well as through the seal on the compressor shaft.
Under The Australian automotive code of
practice for the control of refrigerant
gases during manufacture, installation,
servicing or de-commissioning of
motor vehicle air conditioners 2008 it is against the law to simply add refrigerant to a leaking system or to “Top up”, as the expression is known, before thoroughly examining the system, locating and remedying all known leaks before adding refrigerant.
Therefore Best Practice Procedures indicate that we find the source of the leak and replace or service the component as part of a re-gassing service described below.
If your system refrigerant requires re-charging we will carry out an initial test to find out why, by:
• Identifying the refrigerant used
• Checking system and related components
• Via a recovery unit (if needed), recover any refrigerant
• Run a deep vacuum to remove any moisture
• Leak test with the use of Oxygen Free Nitrogen for at least ½ hour
• Charge with refrigerant as to manufacturers’ requirements
• Best practice principles require that we would recommend changing the dryer or accumulator during the above
•The minimum time for the above is approximately two hours labour
Air Con Repairs
Car air conditioning systems are complex and have few self-service parts. Specialist equipment is needed both to service and repair systems.
Compressor discharge temperature should checked and temperatures at the compressor head, evaporator coil and suction line, condenser coil and liquid line, should be surveyed, using specialist refrigerant equipment such as digital multimeters, pressure/vacuum modules and refrigerant gauges as well as electrical testers. If its possible also the fan motor and if fitted oil pump should be checked.
Accessibility to some of these parts is difficult so time involved will vary depending on the Air conditioning layout of the vehicle in question.
Car Air Con Service & Pipework Repairs
To undertake servicing a system ready for re-charging by vacuuming and pressurisation in order to re-charge the system takes approximately 2 ½ hours Thereafter to re-charge with a full charge of refrigerant according to manufactures recommendations takes but a few minutes.
We then carry out a final test and leave the Air-Conditioning System in good working order. In total this programme takes two to three hours to complete.
Servicing of your vehicle’s air-conditioning system will ensure a long and trouble free life. Best practice includes:
• checking oil and refrigerant levels where applicable
• where applicable using service gauges to determine high and low
pressure settings and volume of refrigerant
• checking the condition of flexible hoses
• Re-gassing as necessary.
In addition to the above. Once every 3 or 4 years the following should be re-placed
The Orifice Tube. The Accumulator or Filter/ Dryer. Compressor oil replaced
And if fitted the suction line filter.
As to the filter dryer, it should be changed whenever
[a] the system is opened
[b] when other components are replaced.
[c] It becomes blocked. This c Can be verified be checking temperature at its inlet and outlets pipes.
Some filter dryers are now part of the condenser.
As to the shaft seal, it should not leak, it is a seal, and leakage indicates wear.
Shaft seals depending on the make and model of compressor can be replaced and the same applies to the magnetic clutch and coil.
Car Air conditioning Service ! How it Works
Here’s how an air conditioning system and its components work.
Compressor: The compressor is the power unit of the A/C system. A drive belt connected to the engine’s crankshaft powers it. When the A/C system is turned on. The Compressor compresses the refrigerant from a Low pressure Refrigerant Vapour [suction] to a High Pressure Vapour [discharge] this High-pressure vapour is passed from the compressor to the top of the Condenser.
Condenser: The condenser is a device used to change the High-Pressure Refrigerant Vapour to High Pressure Liquid. It is mounted ahead of the engine’s radiator, and it looks very similar to a radiator with its parallel tubing and tiny cooling fins. If you look through the grille of a car and see what you think is a radiator, it is most likely the condenser. As the car moves, air flowing through the condenser removes heat from the refrigerant, condensing to and changing it to High Pressure Liquid. This High Pressure Liquid is them passed to the:-
Orifice Tube: Where the High Pressure Liquid drops in Pressure and Temperature to Cold Low Pressure Liquid, which is then passed to the:-
Evaporator/Cooler: [which is inside the cab] The Refrigerant takes up the warm air in the cab via the cooler coils and the Evaporator fans blows the cold air into the cab. The Refrigerant inside the evaporator is now being turned back to a Low Pressure Vapour, but still contains some liquid. This mixture of refrigerant now passes into the Accumulator/dryer This can also acts as a 2nd Orifice as any excess liquid is “Boiled off back to pure Low Pressure Vapour, before it is allowed to pass back to the compressor ready to e pumped around the system again. If fitted with silicon it will also removes moisture from the refrigerant.
In some systems instead of an Orifice Tube being fitted. The system uses a Expansion Valve
Expansion Valve: The expansion valve, which is normally factory set to the Air Conditioners manufacturers’ specification, is probably the most important component in the system. It is designed and pre-set to control the flow of liquid refrigerant via its orifice valve which allows expansion from liquid to vapour (hence its name) as the refrigerant leaves the expansion valve and enters the evaporator, Vast problems will happen if the orifice is allowed to block up with foreign matter
Evaporator: The evaporator is very similar to the condenser. It consists of tubes and fins and is usually mounted inside the passenger compartment. As the cold low-pressure refrigerant is released into the evaporator, it vaporizes and absorbs heat from the air in the passenger compartment. As the heat is absorbed, cool air will be available for the occupants of the vehicle. A blower fan behind the dashboard helps to distribute the cooler air.
As you can see, the process is quite complex. Just about every vehicle’s A/C system works this way, though certain vehicles might vary by the type of components they have.