Frequently Asked Questions About Air Conditioning
Here are 10 reasons why a car’s air conditioning (A/C) might not work properly — and why it’s important to have it serviced regularly:
There is not one answer to this question, but typically it will be one of the following:
- The AC compressor does not start
- The air temperature is not low enough
- The airflow is low
- The air conditioning smells bad
- The AC system is noisy
- The refrigerant is low or missing
Why it happens: Over time, the refrigerant gas leaks or naturally depletes.
Why service it: Without enough gas, the system can’t cool properly and may overwork the compressor, leading to costly damage.
Why it happens: The compressor can seize or fail due to lack of use, contamination, or low refrigerant.
Why service it: Regular use and servicing keep the compressor lubricated and prevent it from seizing up.
Why it happens: Dust and debris clog the filter, reducing airflow.
Why service it: Replacing the cabin filter improves air quality, cooling performance, and prevents musty smells.
Why it happens: Rubber seals and hoses deteriorate, causing refrigerant and lubricant leaks.
Why service it: During a service, technicians can spot leaks early and reseal the system before major repairs are needed.
Why it happens: Modern A/C systems rely on sensors and relays that can fail.
Why service it: A diagnostic check can identify faulty components before they cause a full system shutdown.
Why it happens: Dirt, insects, or corrosion block the condenser (at the front of the car).
Why service it: Cleaning or flushing these parts helps maintain efficiency and cooling power.
Why it happens: Refrigerant gas carries oil that lubricates the compressor. Low gas = low oil.
Why service it: Regular regassing includes oil top-up, protecting the compressor from wear.
Why it happens: Moisture buildup in the evaporator allows bacteria and mould to grow.
Why service it: Cleaning and disinfecting the system keeps it fresh and prevents respiratory irritation.
Why it happens: Incorrect refrigerant charge or faulty thermostatic expansion valve (TXV).
Why service it: A service ensures correct pressures and temperatures for consistent cooling.
Why it matters: Ignoring A/C issues can lead to compressor failure — one of the most expensive components to replace.
Why service it: Routine servicing (every 1–2 years) saves money in the long run and keeps the system efficient.
