News Blog from Autospark

Why is my Car Air Conditioning not working?

SEPTEMBER 2015

We're all eagerly waiting for the summer to come, but one thing we certainly aren't looking forward to is popping on the car's air conditioning only to realize it's not blowing cold air. If it's one of those days when putting down windows won't be enough to cool down, then the last thing you want is your car air conditioning not working. Unfortunately, diagnosing problems with an air conditioning system can be very complicated, and that's why calling a car air conditioning regas expert is essential to getting it working again.

We've listed a few of the most common car A/C problems and provided some quick turnarounds that may help you fix them.

1. Car A/C Not Blowing Cold Air

Probably the most common issue Aussies face with their car's A/C is blowing warm or moderately cool but not cold air. There are a few reasons that can lead to this issue:

  • Failed compressor or compressor clutch
  • Clogged expansion tube or refrigerant charging hose
  • Damaged or failed condenser or evaporator Vacuum leaks
  • Failed switch, fuse, relay, control module, blend door or solenoid
  • A Freon leak caused by a failed o-ring, seal, hose or component
  • Leaks are usually the most devastating. If your car's air con develops a leak, you have what is called an "open system." Not only will this affect your cold air, but may also result in damage to vital components.

    To diagnose the problem:

    • Look for any blockages caused by leaves, dirt or bugs that would prevent air from passing over the condenser.
    • Check if the cooling fans on the condenser or radiator are running when the A/C system is on.
    • Check the cabin air filter to ensure that it's not clogged.
    2. Weak Airflow

    Sometimes, the airflow of your A/C system may become weaker. There are many factors that can greatly impact the airflow of the system. These include:

    • Loosening of a hose, most commonly the hose that supplies air to the blower unit.
    • Frying/burning of the ventilation fan. If the fan is not blowing, then airflow will be weaker.
    • Accumulation of mould and mildew in the evaporator core. If this happens, air will have trouble reaching the air vents.
    • Opened-up seals that diminish air flow. Your car's A/C ventilation system is very sensitive, and should remain sealed. If seals open, the system is compromised.

    To diagnose the problem:

    • Look at the cabin air filter. If it's blocked, make sure to replace it.
    • Check for a blower motor problem. To do this, turn on the heat. If the airflow is weak, the blower motor may have gone out.
    3. Cold Air Turns Warm

    Another common issue Aussies experience is their A/C systems starting out cool then getting warmer. This can pose major risks to the whole system, so you should call a specialist and have him inspect the issue. Some factors that may cause the air to turn warm are:

    • Faulty compressor clutch: if the clutch doesn't engage with the compressor, then the compressor won't be capable of maintaining the correct pressure, resulting in hot air.
    • Clogged expansion valve: The expansion valve distributes the refrigerant to the evaporator. If it's clogged, then the refrigerant won't flow into the evaporator. This can result in the expansion valve literally freezing if moisture is present, leading to hot air.
    • Leaks: If any leaks are present, the A/C system may start blowing warm air.

    To diagnose the problem:

    • Check hose manifolds on the compressor.
    • Check where the evaporator drains condensation with UV light. Check the Schrader Valves.
    • Check around all fittings to verify that they are all secure.

    Avoid air con regas kits as they're not helping you find the cause of the problem. Instead, take your A/C system to a specialist auto electrician to investigate the issue and get your air conditioning working like it should again!

    "The next day I picked up my car and everything was fixed. I was very thankful it was done so quickly, as I am lost without my car...."

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