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THE NOISE – Thermo fan switching on

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THE EFFECT
The cooling system will maintain normal operating temperature under all driveable conditions. 

THINGS TO LOOK FOR
It’s always a good idea to look at the thermostatic fan to understand how it operates.  Because thermostatic fans are thermostatically controlled and they should switch on and off.  A good thermostatic fan in a very good cooling system will switch on for somewhere between 20-40 seconds.  If the fan switches on for longer than 60 seconds this might be a cooling system that is unable to cool down with the thermostatic fan.  Another problem might be associated with the cooling system.  If the fan stays on for 5 seconds, this is an excellent cooling system as it never requires a lot of effort from the thermo fan.

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