Well, in a manner of speaking. I have the manual type of thermostat. It has 4 speed settings, but only the highest one works. I've already tested the switch mechanism and it works just fine. I also tried switching relays, nothing. What could the problem be?

 

the resistance must be blown...I had the same proble on my previous acura...there's a resistance wich controls the speed 1,2 and 3 reducing the amount of electricity going in the fan blower and when this resistance is gone, it's not working...the reason why it's working full blast (speed 4) is that on this setting, there's no need for a resistance and all the electricity is all going in the fan...check your fan blower resistance...

J-P

 

same thing happened to my dads truck...according to the gay *** dealership....it was a blown resistor within the ac switch? i dont care....warranty covered it anyways

 

@ thread title. . . . its in the faqs, it explains your exact situation.