I have not really done allot of searching but I have never sorted this problem, I only have one speed on heating fan in my car, it's been very annoying
as it either blast you or nothing at all it's been like this since i got the car and i managed to fix it slightly to get 2 speeds but its gone again, i need the variable resistor fan speeds, it's only on the GPVr someone mentioned it may be on the colt but couldn't / didn't find out.
I know it's more rare for a Vr to be broken but if anyone knows of one going;)