A/c Switch half works?

[messy]

Hi guys, first up my A/C is not the electronic climate control unit, i have the turn knobs for fan power and tempreture etc. ok so heres whats going on:

Today went to get the car washed, as far as i remember, everything is fine (very hot day today so i know the A/C worked this morning), got the car back and driving home i realised the "power knob" (fan speed) would only work in the 3rd and 4th position

The first 2 positions have no response at all?!?! (applies with both heat / cool etc)

any suggestions from anyone? is it possible ive blown the low air flow settings fuse or something?

please help!

[messy]

Update: If i turn the knob to either 1st or 2nd position, the A/C is registering that it turned on as i can hear the motor hum change and also the green light switches on.. but no air!! =[

anyone? anything?

[dstocks]

Could well be your climate control unit (I know of a few people that have had to change them over). I would be trying to lay my hands on a spare and testing it.