Hey everyone. Today when I was driving in my E36, it was frigid cold, so i went to turn on the heat, but when i turned the knob to number 1, nothing came out, same for 2 and 3, but when i turn to 4, the heat comes on full blast, as its supposed to. I dont get it, when i turn it to the others, i can hear this electronic noise as if the heat is gonna come out, but it doesnt. Please help me!
Thanks