I am a lucky person....not only do I own a relatively decent vehicle in my 85 K5 but Uncle Sam pays me top dollar to spend my day looking through the thousands of posts on this website about how to make my before mentioned ride even better!!! Anyway, the real question is...my blower motor only works at one speed...high. Also, when switching between positions (i.e. defrost, vent, etc.), the idle tends to stay high until I turn it off or switch it from say defrost to heat. What are some of the things that could cause this to happen. I am still learning how to fix stuff (I just had a wonderful time replacing front leaf springs...damn metal bushing inserts!!)on my ride so forgive my ignorance.