Many Opel Astra J owners report fluctuations in the temperature gauge. This is more noticeable in hot weather and during long drives.
Symptoms
- Temperature needle rises and falls repeatedly
- Cooling fan runs constantly
- Engine runs hotter than normal
- Pressure builds up in radiator cap
Possible Causes
- Faulty thermostat
- Inefficient water pump
- Blocked radiator or hoses
- Faulty coolant temperature sensor
Solutions
- Replace faulty thermostat
- Repair or replace water pump
- Flush radiator and cooling system
- Replace coolant temperature sensor
Preventive Maintenance
- Check antifreeze level regularly
- Keep radiator clean
- Inspect coolant level during every service
Conclusion
A fluctuating temperature gauge may look minor but can cause major engine damage if ignored.
