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Could be one of two things...
The switch that turns on your fan could be failing. wiggle it to see if that helps, otherwise you will need to have it tested with a meter, or test light.
Or, there is a resistor deal near the motor (under the dash on the passenger side close to the floor) Look to see if it looks burnt, as this is a common problem.
check out the hazard warning switch,cavalier is the same as opel astra ,then its same as my car with a vauxhall badge?? hazard switch on dash in middle above radio ,they play up something cronic if used too much either lights stay on or dont work at all