rover 45 overheating

[salah]

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can any one help me please? with overheating problems as i start the car and after running or idling for 20 to 30 minutes the temperature gauge flies to the maximum(red mark), and boils the coolant and when i unplug the fan from the teperature switch the fan works fine and the engine cools down and temperature gets back down to the normal, i have also replaced the tempreature switch but did not make any difference, this car has only done 35k miles some people suspect head gasket failure but most think that it is something else as it is not losing any coolant at all.

thank you for helping

[Tom Scott]

Is it using oil?

Does the fan come on when its plugged in?

Has it had a new thermostat fitted?

[salah]

the fan does not start unless i unplug it from the temperatrue switch and i have also put a new temperature switch but did not work, any way thank you mate for helping.

[Tom Scott]

Ok... Is it using oil or coolant at all?

[salah]

no oil no coolant use it is just the fan not coming on i will take it to another garage tomorrow anyway, thank you for your effort to helping me.