Car Batteries and Air Con in Gladstone Heat

This guide is for Gladstone drivers who want their car to start every morning and keep the cabin cool through summer. It explains what heat does to batteries, how to choose and look after one, and the electrical faults that stop air conditioning working. Refrigerant work is for a licensed technician, so this guide sticks to the electrical side.

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How warm Gladstone gets

Gladstone sits just south of the Tropic of Capricorn, and its summers are long and warm. Bureau of Meteorology long-term averages for the Gladstone Airport weather station show a mean January maximum of about 31°C and a mean January minimum of about 23°C. Even in July, the mean maximum is around 23°C.

Those are air temperatures in the shade. Under the bonnet of a car that has just driven along the Dawson Highway, or inside a cabin parked in an open car park in Clinton, it gets much hotter. Batteries and air conditioning components work in those temperatures for months at a time.

What heat does to a battery

A lead-acid car battery stores energy through a chemical reaction between lead plates and acid. Heat speeds up that reaction, which sounds helpful, but it also speeds up the wear. The plates corrode faster, water in the electrolyte evaporates, and the battery slowly loses its ability to hold charge.

The damage builds over summer and often shows up later. A battery cooked through January and February may start the car fine until a cooler morning in May, when the engine needs a little more effort and the battery can't deliver. That's why many Gladstone drivers are caught out by a flat battery when the weather turns, not during the hottest weeks.

Heat also raises the self-discharge rate. A car left parked for a fortnight in summer loses more charge than one parked in winter, which matters if you fly out for work or holidays.

Signs your battery is on the way out

Batteries in hot climates often fail with little warning, but there are usually some clues:

• The engine cranks more slowly than it used to, especially first thing in the morning.
• The stop-start system stops working or works less often.
• Interior lights dim noticeably when you start the car.
• The battery case looks swollen or the top is wet with acid.
• There's white or green crust building up on the terminals.
• The battery is more than three or four years old and has never been tested.

Testing and choosing a battery

A voltmeter reading tells you the state of charge, but not how healthy the battery is. A load test or a modern conductance tester gives a much better picture. Our guide on how to test a car battery explains the readings. Having the battery tested at each service is the easiest way to avoid being stranded.

When replacing a battery, match the type the car was built for. Cars with stop-start or smart charging usually need an AGM or EFB battery, and some need the new battery registered with the car's computer. Our guide on car battery types explained covers the differences. For hot climates, a battery with a good warranty and a heat-resistant design is worth the extra cost.

Looking after a battery in the heat

You can't change the weather, but you can help your battery cope:

• Park in the shade or under cover where you can, especially for long periods.
• Keep the battery terminals clean and tight so the alternator can charge it properly.
• Check that the battery hold-down is secure, as vibration shortens battery life.
• If the car sits for weeks, use a smart charger or maintainer.
• Take a longer drive now and then if most of your trips are short runs around town.
• Replace a battery that tests weak before the cooler months arrive.

When the air conditioning goes warm

In Gladstone summers, a car without working air conditioning is hard to live with. When the air goes warm, many people assume it needs a regas. Often, though, the cause is electrical, and an electrical fault is worth ruling out first because it's usually cheaper to fix.

The compressor is driven by the engine through an electromagnetic clutch. If the clutch doesn't get power, the compressor doesn't run. Pressure switches protect the system and can cut power to the clutch if they sense a problem or fail themselves. Condenser fans move air over the condenser at the front of the car, and if they stop, the system can't get rid of heat when you're stopped in traffic. Relays and fuses control all of it. Our guide on common car air conditioning problems runs through the usual faults.

Electrical checks before a regas

Some simple checks can point to an electrical fault:

• With the engine running and the air on, check whether the condenser fan behind the grille spins.
• Listen and look for the compressor clutch engaging when you turn the air on.
• Check the air conditioning fuses and swap the relay with an identical one to test it.
• Note whether the air is cold on the highway but warm in traffic, which often points to the fan.
• Check whether the cabin fan works on all speeds. If only top speed works, the blower resistor may have failed.

Licensed work and getting help

Any work on the refrigerant side, including regassing, recovering gas and opening the system, must be done by a licensed technician. Leave gas top-ups to the professionals too. The wrong refrigerant or the wrong amount can damage the compressor, and some refrigerants are flammable.

Many auto electricians do both electrical diagnosis and air conditioning service. Ask whether they hold the right licence for refrigerant work when you book. For local advice in the family suburbs, see our pages for Clinton and Kirkwood.

Parts for this job

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Get it done: get a quoteDo it yourself: shop blower resistors

Questions Gladstone drivers ask

How long does a car battery last in Gladstone?

It varies with the battery type, the car and how it's driven, so there's no fixed number. Heat speeds up battery wear, so batteries in warm climates often don't last as long as the same battery would in a cooler place. Have yours tested at each service, and replace it when it tests weak rather than waiting for it to fail.

Why does my battery die in autumn after a hot summer?

Heat damages the battery's internal plates during summer, reducing its capacity. The battery may still start the car while it's warm, but when the mornings cool down, the engine needs more effort to crank and the weakened battery can't deliver. A test before the cooler months can catch it early.

My air con blows warm. Does it need a regas?

Not always. A failed condenser fan, compressor clutch, pressure switch, relay or fuse can all stop the air conditioning working, and these are electrical faults. Have the electrical side checked first. If the system does need gas, that work must be done by a licensed technician.

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