Does the radiator fan work immediately you start the engine or it when hot

Hello, your condenser fan should operate with your air conditioner compressor operating. If it is not, it could definitely lead to an overheating condition, as it could be a sign there is something wrong with your engine cooling system. Testing the cooling system operation even independent of the air conditioning system is necessary.

There is a temperature sensor that signals to the fan when to turn on and at what speed. So no, it's not always on when you start it. Hands-on inspection is needed to diagnose your issue if you don't normally work on cars. Use this link to find a good shop near you. https://repairpal.com/repair-shops Alex