Just before I got hurt I noticed the Max setting on the Riv didnt work anymore. A/C is cold and all vents work as they are supposed to but when switched to "max" the blower shuts off and I get no air flow in the cabin. My first thought was a blower resistor. Ordered one from Buick farm. This week Im well enough to get around out in the shop a bit. replaced that part and still have the problem. Any Ideas?
High speed fan is wired through the high speed relay on the firewall on AC cars because of the amount of current that is required. So check the relay and the connectors.
