HVAC Blower all of a sudden only work on high speed or low speed? After initially checking the fuse block, often the blower motor resistor will burn out like the one pictured and needs to be replaced. The resistor is located in the HVAC box on the passenger side foot-well of the Gen 3 and 4 Vipers and can be changed out in minutes to have that A/C or heat back up and running on all speeds. Same resistor works on all 03′ – 10′ Viper SRT-10’s.
Viper HVAC Blower Motor Resistor 03′-10′ Viper SRT-10