Perth's summer is one of the most demanding environments for vehicle cooling systems in Australia. When temperatures exceed 40°C and you're stuck in city traffic with the AC running, cooling systems are working at their limit. An overheating vehicle needs immediate action.
What To Do Immediately
If your temperature gauge is in the red or an overheat warning appears:
- Turn off the air conditioning immediately — this reduces engine load
- Turn on the heater to full heat — this helps dissipate engine heat through the cabin heater core
- Find a safe place to pull over as quickly as possible
- Turn the engine off and do NOT restart it
- Do NOT open the radiator cap — the cooling system is under pressure and will spray scalding coolant
- Wait at least 30 minutes for the engine to cool before approaching the radiator
What Causes Overheating?
- Low coolant level — most common cause, often from a slow leak
- Faulty thermostat — stuck closed, preventing coolant circulation
- Failed radiator fan — fan not turning on when needed
- Blocked radiator — restricted airflow through the radiator core
- Head gasket failure — most serious cause, allows combustion gases into the cooling system
- Water pump failure — pump not circulating coolant
What Overheating Can Cost
- Thermostat replacement: $150–$300
- Radiator fan replacement: $300–$600
- Water pump replacement: $400–$900
- Head gasket repair: $1,500–$4,000+
- Engine replacement (from severe overheating damage): $3,000–$15,000+
The cost progression shows why stopping immediately is so critical. A vehicle that overheats briefly and is shut down promptly often needs only minor cooling system repairs. One that is driven for 10 minutes while overheating can suffer permanent engine damage.
Prevention
Check your coolant level monthly during Perth's summer. A quick check under the bonnet takes 30 seconds and can prevent a five-figure repair bill. If your level is repeatedly low, there's a leak that needs diagnosis before summer arrives.
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