Car overheating
An engine that runs too hot can be damaged quickly, so overheating is something to deal with straight away. The causes are usually found in the cooling system.
General guide in plain words. It is not a diagnosis and gives no prices: only a workshop that inspects your car can say what is wrong.
Likely causes
Low coolant from a leak
A leaking hose, radiator, water pump or gasket lets coolant escape. If the level is low, the engine cannot shed its heat.
Radiator fan or fan motor not working
In traffic, the fan pulls air through the radiator. If it fails, the engine can overheat when slow or stopped.
Thermostat stuck closed
The thermostat controls coolant flow. If it sticks shut, the engine heats up and the top radiator hose may feel very hot while the bottom stays cool.
Blocked radiator or faulty cap
Dirt or scale can restrict flow, and a weak radiator cap cannot hold the pressure the system needs.
Water pump failure
If the pump stops circulating coolant, temperature rises. A leak or a noise from the pump area can be a clue.
Head gasket problem
A failing gasket can push combustion gases into the coolant or let coolant mix with oil. It is more serious and needs prompt attention.
What to tell the workshop
- When it runs hot: in traffic, on the highway, or with the aircon on.
- Whether the coolant level has dropped and if you see leaks or puddles.
- Steam, a sweet smell, or white smoke.
- Whether the heater blows hot or cold.
- Any recent work on the cooling system.
Workshops customers mention for this
Matched from what customers mention on Google Maps, in our own words. This is not an endorsement, and a workshop has to inspect the car to confirm any cause.
Bedok Industrial Park E
- Hock Eng Automobile Workshop
Customers mention: Aircon cooling coil replacement
Defu Industrial Estate (Defu Lane)
- Hon Win Motor
Customers mention: Coolant leak repair
Jalan Lam Huat and Carros Centre
- Major Autolution
Customers mention: Cooling coil replacement (Mercedes W213), Radiator fan motor check
- RK One Stop Autohub
Customers mention: Radiator and water pump
Kaki Bukit Industrial Estate
- HW AUTO SERVICE CENTRE
Customers mention: Coolant leak repair
Serangoon Garden Way
- Motoserv Car Service Centre @Serangoon Garden
Customers mention: Aircon cooling coil replacement
Sin Ming Industrial Estate
- 1 Car Service
Customers mention: Radiator fan replacement
- M WERKZ
Customers mention: Coolant leak repair
Toh Guan Road East and Enterprise Hub
- Lay Auto Garage
Customers mention: Coolant system repair
- TT Motorsport @ Jurong
Customers mention: Overheating and radiator repair
Woodlands Close (MEGA@Woodlands)
- RevUp Auto
Customers mention: Coolant leak repair
More: Servicing
Questions
Can I top up with water?
In an emergency it may get you to a workshop, but the correct coolant mix protects the engine. Ask the workshop to check the level and find the leak.
Is overheating always the radiator?
No. The fan, thermostat, water pump or a leak can all cause it, which is why a pressure test and a fan check help.