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Hi Scotty

I have a 2005 Mazda 6 2.0 petrol, the engine has been over heating and smoke coming from the exhaust, the radiator fans dont turn on unless I disconnect the coolant temperature sensor and bridge the connection, the fan doesn't come on when I turn on the a/c, I've changed the temp sensor but it didnt fix the problem

Jamie

Glasgow, Scotland

often a bad main computer does that not turning the fans on, but smoke comes out now shows engine head gasket is probably blown now