Car air conditioning has a habit of failing on the first genuinely hot day of the year — which is exactly when every workshop in Perth is booked out. A bit of attention through the cooler months saves you sitting in a hot car in February.
Run it through winter
This is the one most people get wrong. The compressor has seals that need refrigerant oil circulating through them to stay pliable. If the system sits unused for months, those seals dry out and start to leak. Run your air con for ten minutes every couple of weeks, even in winter.
Watch for gradual weakening
Air conditioning rarely fails all at once. It usually gets slowly less cold over a season or two as refrigerant escapes through a small leak. If yours isn’t as cold as it was last year, that’s worth investigating now — running a system low on refrigerant can damage the compressor, which is the expensive part.
Change the cabin filter
A blocked cabin filter chokes airflow and makes the system feel weak even when it’s working perfectly. It’s also where musty smells come from. Most cars need one every 12 to 24 months, sooner if you’re regularly on dusty or unsealed roads.
Keep the condenser clear
The condenser sits at the front of the car, ahead of the radiator, and it needs airflow to shed heat. Leaves, insects and road debris pack into it over time. A gentle rinse from the engine side can make a noticeable difference.
Take unusual noises seriously
Rattling or grinding when you switch the air con on usually means the compressor clutch or bearing is on the way out. Continuing to use it can turn a repairable fault into a full system replacement, because a failing compressor sends metal debris right through the lines.
If your air con isn’t performing the way it used to, book it in for a check before the weather turns.