2005 Chevy Malibu fan motor on 1 2 & & 3 inop 4 and

Heater problem
2005 Chevy Malibu 4 cyl Front Wheel Drive Automatic 70 k miles

fan blower inop on 1,2,3, works fine on 4 and 5 positions,, I had this same problem with a motor home with the same system,, is this the relay that operates the low sides,,, if so, where is this relay located.... thanks in advance