Thermal Switch — Maruti Suzuki Swift
Category: Cooling | Severity: high | Cost: ₹500–₹2,000
What is Thermal Switch?
An electrical switch that activates the radiator fan based on coolant temperature.
How Thermal Switch Works
Monitors coolant temperature and triggers the cooling fan when a threshold is reached.
Why is Thermal Switch Important?
Prevents engine overheating by ensuring timely fan operation.
Common Problems
- Switch failure
- Incorrect triggering
- Electrical faults
Symptoms
- Radiator fan not working
- Engine overheating in traffic
- Fan running continuously
Causes of Failure
- Electrical wear
- Sensor failure
- Wiring issues
Impact on Car Performance
Overheating or unnecessary battery drain.
DIY Fix Guide — Step by Step
- Check fuse and wiring
- Test switch continuity
- Replace faulty switch
Maintenance Tips
- Inspect wiring regularly
- Check fan operation periodically
Replacement Cost in India
Estimated range: ₹500 – ₹2,000
Where to Buy Online
When to Replace Thermal Switch
When radiator fan fails to operate correctly.