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Kklim

Coolant overflowing from expansion tank

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6th Gear

Was almost home after dinner when overheating light kit up. Turned off engine, opened up bonnet and noticed water was flowing out of the plastic expansion tank at its cap. Radiator itself seemed ok. What could be the cause? Bad radiator cap, blown fan fuse (checking tomorrow), stuck thermostat, bad water pump?

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Supersonic

All are possibilities...cap is the cheapest fix. Try get one from someone with the same model to see if that’s the cause. 

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Turbocharged
36 minutes ago, Kklim said:

Was almost home after dinner when overheating light kit up. Turned off engine, opened up bonnet and noticed water was flowing out of the plastic expansion tank at its cap. Radiator itself seemed ok. What could be the cause? Bad radiator cap, blown fan fuse (checking tomorrow), stuck thermostat, bad water pump?

Do you need workshop recommendation?

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Supersonic (edited)

If diesel, it could be valve cover gasket uplorry

Once cool down, top up radiator before drive to mechanic 

Edited by inlinesix

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Twincharged
41 minutes ago, Kklim said:

Was almost home after dinner when overheating light kit up. Turned off engine, opened up bonnet and noticed water was flowing out of the plastic expansion tank at its cap. Radiator itself seemed ok. What could be the cause? Bad radiator cap, blown fan fuse (checking tomorrow), stuck thermostat, bad water pump?

What you said are all possible, check if the radiator fan is blowing when engine gets heat up. It could be a malfunction water pump as well, not completely dead but inefficient.

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6th Gear
16 minutes ago, kobayashiGT said:

Do you need workshop recommendation?

Yes, please. Prefer AMK or Sin Ming so don't have to drive too far. Thanks.

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Turbocharged
Just now, Kklim said:

Yes, please. Prefer AMK or Sin Ming so don't have to drive too far. Thanks.

What car are you driving, If you don't mind sharing. . .

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6th Gear
10 minutes ago, Ct3833 said:

What you said are all possible, check if the radiator fan is blowing when engine gets heat up. It could be a malfunction water pump as well, not completely dead but inefficient.

Aircon was less cold so I think the fan wasn't working. 10-year-old Sylphy BTW.

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Twincharged
4 minutes ago, Kklim said:

Aircon was less cold so I think the fan wasn't working. 10-year-old Sylphy BTW.

Someone had the same problem long before you.

 

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5th Gear
1 hour ago, Kklim said:

Was almost home after dinner when overheating light kit up. Turned off engine, opened up bonnet and noticed water was flowing out of the plastic expansion tank at its cap. Radiator itself seemed ok. What could be the cause? Bad radiator cap, blown fan fuse (checking tomorrow), stuck thermostat, bad water pump?

Very likely blower connector corroded lor.  Is the fan spinning ?

If connector, go value shop buy a terminal block 80cts.  Scissor cut cut.  OK liao.

 

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6th Gear (edited)

Just checked. Fan fuses ok and radiator is full. Stuck thermostat?

Edited by Kklim

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Twincharged
13 minutes ago, Kklim said:

Just checked. Fan fuses ok and radiator is full. Stuck thermostat?

Fan fuse ok but is the fan spinning ? The fan motor might be gone. Water pump worth checking too. drive your car  to a mechanic  for a check better.

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6th Gear

Thanks, guys. Waiting for AA tow truck.

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Supersonic (edited)
14 hours ago, Kklim said:

Was almost home after dinner when overheating light kit up. Turned off engine, opened up bonnet and noticed water was flowing out of the plastic expansion tank at its cap. Radiator itself seemed ok. What could be the cause? Bad radiator cap, blown fan fuse (checking tomorrow), stuck thermostat, bad water pump?

When everything cooled look at the radiator cap. Thing to look out for is the rubber seals underneath the cap. Should be about 2-3 layers at different levels. See whether it gives a tight feel when turning to lock the cap. If leng leng means it's as good as open. It's good to check it every 2-3 years.

Edited by Watwheels

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Supersonic

My guess is a simple stuck thermostat.

It didn't open to let the coolant flow into the engine. Engine overheat.

Water pump continues to pump and the coolant back up into the overflow tank.

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6th Gear (edited)

Workshop diagnosed as blown head gasket. There was some oily deposit in expansion tank. 10 years liao (just renewed COE).

Edited by Kklim

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Supersonic
3 minutes ago, Kklim said:

Workshop diagnosed as blown head gasket. There was some oily deposit in expansion tank. 10 years liao (just renewed COE).

Diesel engine?

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6th Gear
Just now, inlinesix said:

Diesel engine?

Petrol. Sylphy G11 1.5L auto. Only go over 3K rpm on NSH

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