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Car service in Northmead
As your local Mechanic in Northmead, Metcalfe Automotive Centre take great pride in offering our clients the very best in car servicing and automotive repairs. (MVRL47697)
Read moreAre you feeling hot and bothered?
When the temperature rises, nothing matters more on the road than a properly working air conditioning system. Your car’s A/C doesn’t just provide comfort — it also helps with visibility and safety by reducing humidity and defogging windows. Regular servicing can prevent costly repairs and keep your system working when you need it most.
How Car Air Conditioning Works
Your vehicle’s air conditioning system is a closed-loop refrigeration cycle that moves heat from inside your car to the outside air. The key components include:
- Compressor: The heart of the system, driven by the engine belt, it pressurises and circulates refrigerant.
- Condenser: Like a small radiator at the front of the car, it releases heat from the high-pressure refrigerant.
- Expansion device: Causes a dramatic drop in pressure and temperature as the refrigerant enters the evaporator.
- Evaporator: Inside the dashboard, cold refrigerant absorbs heat from cabin air blown over its fins.
- Blower fan and ducts: Push cooled air into the passenger cabin.
This constant cycle transfers heat out of the vehicle and keeps you cool even on the hottest days.
Common Reasons Your A/C Might Fail
Even a well-built system can develop issues over time. Typical causes of reduced cooling include:
Low Refrigerant / Leaks
The refrigerant is essential for cooling. Because the system is sealed, low levels almost always mean there’s a leak somewhere — worn hoses, loose fittings, or failing seals.
Compressor Problems
The compressor pressurises the system. If it fails, the refrigerant won’t circulate and the A/C won’t cool.
Blocked Condenser or Evaporator
Dirt, debris, and bugs blocking airflow can drastically reduce heat exchange and cooling performance.
Electrical & Control Issues
Faulty wiring, blown fuses, sensor failures, or control module faults can prevent the system from running correctly.
Clogged Cabin Air Filter
A dirty cabin air filter restricts airflow, weakening cooling and reducing comfort.
Symptoms That Your A/C Needs Attention
Look out for these common warning signs:
- Warm or weak airflow — often due to low refrigerant or compressor trouble.
- Unusual noises when the A/C runs (squealing, rattling) — possible compressor or belt issues.
- Musty or bad smells — can indicate mould or a clogged filter.
- Water inside the car while running A/C — a blocked drain hose may be the cause.
Why You Should Service Your A/C
At Metcalfe Automotive Centre, our qualified technicians have Arctick Authorisation (AU25288), which means we inspect, repair and legally recharge refrigerant in compliance with environmental regulations. Refrigerant must be handled and replaced properly — ARCTick licences ensure technicians can detect and repair leaks before recharging your system.
Regular servicing every 12 months can:
- Maintain optimum cooling performance
- Improve fuel efficiency by reducing unnecessary load on the engine
- Prevent costly breakdowns by catching leaks and component wear early
- Ensure healthier cabin air quality
This preventative approach saves money and stress down the road.
Car air conditioner getting a bit smelly?
Ask about our MIST service. A mist service will kill any bacteria that may be lurking in your car's air system. This bacteria can cause odours and even make you sick, especially if you have allergies or asthma. A MIST clean of your system uses ultra sonic technology to ensure that your car's air con system is clean and free of nasty bugs - making your car not just small better but makes it healthier for you and your family.
Don't suffer through the summer heat with a malfunctioning air con. Visit our Northmead workshop for reliable, professional, and Repco-authorised air conditioning services. Your comfort and safety are our top priority!
Questions about your car's air con?
Your vehicle ought to be taken to a reputable workshop such as Metcalfe Automotive Centre regularly to make sure the air conditioning system continues performing efficiently as well as having the mechanics examine the condition of the entire car.
How do air conditioners work?
A car air conditioner system is composed of four essential parts :
- A belt-driven pump known as a compressor to compress and circulate gas.
- A radiator like unit called a condenser to redistribute heat and condense gas to a liquid.
- An expansion device, which could be a thermal expansion valve (TXV) or an orifice tube (subject to the kind of air-con system used).
- Some systems have an accumulator before the compressor to remove moisture from the refrigerant while TXV systems have a receiver-dryer before the evaporator performs the same crucial task. Both of these parts also store refrigerant.
Car air conditioning is designed to pull the heat from the air within the car's interior area and transfer it outside, leaving only cooled or 'conditioned' air to be redistributed. Hot air is passed across a gas-filled evaporator, where the heat is easily absorbed by the refrigerant (in gas form), effectively removing the heat from the air in the car.
The now heated gas is pulled through the compressor where it is further heated (via compression). The next stage involves the refrigerant being forced through the condenser to extract the refrigerant's heat quickly. The refrigerant, now condensed to a liquid, then moves through the expansion device (either a TXV or Orifice tube), which regulates the refrigerant's flow to the evaporator, changing the high-pressure liquid to a low-pressure mist (gas). A fan blowing over the evaporator's cold fins produces the cold air being blown into the car, and the entire process then begins all over again.
Does the car air conditioner use more fuel?
Yes! Your car air conditioning is using fuel. However, it's actually more fuel efficient to run car air conditioning than it is to have your windows down due to aerodynamic drag. If your air conditioning isn't performing its best, it may use more fuel to run. To avoid this, it's important that you have your air conditioning serviced regularly by professionals, like the ones at Metcalfe Automotive Centre.
What's the cause of the bad smell in car air conditioning?
The damp environment can promote microbes, bacteria and even fungus growth inside the evaporator core. This can lead to nasty smells and possibly even be bad for the health of any vehicle occupants. Although modern evaporator units tend to be more efficient, they have more fins, meaning an increased capability to trap moisture and allow for micro-organism development.
How do I know my car air conditioning is due for a service?
If you cannot remember when your air conditioning was last serviced, perhaps it's time to book in with the team at Metcalfe Automotive Centre. You should also book in if:
- Your air conditioning system is blowing warm air
- There are damp patches or water stains under your dashboard
- Your car air conditioning system smells funny
- Your car air conditioning system is making strange noises
- There is weak air flow from the car air conditioning system
Why does the car air conditioner need to be serviced?
Car air conditioning is designed to pull the heat from the air within the interior area of the car outside, leaving only cooled or 'conditioned' air to be redistributed. This is achieved using a special compound called refrigerant, capable of readily absorbing heat as a gas and quickly losing heat as a liquid.
The compressor needs the right amount of oil in the refrigerant to prevent it from seizing up. Should the air filters be jammed with dirt and bacteria, it will affect the entire system's performance, and it can even cause it to stop working altogether. On top of inhibiting air conditioner efficiency, dirty air filters can cause health problems.
Being exposed to the elements and very diverse operating conditions and being used intermittently rather than being 'Always On' can cause decay of the hoses, connections and seals. A vehicle air conditioning system should be examined regularly to ensure there are no problems or refrigerant loss due to failure or leakage from these points.
Simply by cooling the air in your car under normal running conditions, the air filters get dirty and intermittent use can cause seals to dry and crack, allowing them to leak. Even without leaks, the gas in a car air conditioning system will eventually begin to degrade or evaporate over time. It should be recharged as required to keep the air con system in peak running condition.
How often should a car air conditioner be serviced?
Your automotive air conditioning system needs to be examined once a year for any signs of problems with the seals, hoses and connections and confirm there is no refrigerant reduction over time. Regularly servicing your automotive air conditioner system keeps refrigerant at optimum levels meaning the system does not need to work as hard. This, in turn, protects the system from damage and minimises fuel expenditure.
Can I service my own car air conditioner?
Only qualified mechanics with the appropriate training, like the ones at Metcalfe Automotive Centre, should attempt to service a car air conditioner. Specific licences are required to service or repair some types of car air conditioning systems, especially where re-gas (recharging of the refrigerant) is concerned. Strict guidelines and procedures must be adhered to when handling certain refrigerants, which must always be fully recovered and not allowed to escape into the atmosphere during servicing.
Refrigerant can also pose serious health risks if mishandled. Specialist equipment is also required as the air conditioning system is under extreme pressure and must be pulled into a deep vacuum to remove any moisture, to avoid seriously damaging the system. You can find out more about licensing on the Australian Refrigeration Council (ARC) Website.
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