Lumina fan blower

mom and dads fan blower only works on the high speed. the control is the push-button type. what can i do for them?

Though it’s possible that the push-buttons have gone bad, it’s more likely the blower motor resistor pack has failed. You could just change the resistor pack and hope that does it, or, you could use a voltmeter and the wiring diagram to be surer of your diagnosis.,APP1256458/vehicleId,2388301/initialAction,partProductDetail/store,505/partType,01160/shopping/partProductDetail.htm;jsessionid=D75D4F8D77AE2179962803FED2161E51 Click here to see what the resistor pack looks like.