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why does my fan on my vectra keep coming on constantly?

the fan on the radiator is constantly on even when the ignition is off.
deano, March 2009
Possibly a faulty thermoswitch, try unplugging it.
I think it's on the left side of the radiator as you look at the engine, in front of the power steering pump.( My vectra isn't here to check)

biffo, March 2009
link Click here to see other fixes for Opel Vectra.