to EdmundCWheeler - from your description, and to the other parties interested regarding the fan speed. As for what you're describing, in my opinion, you (we, meaning me and all of you with this problem), we need to replace that control module. I'm not referring to the fan control resistor, (RU567{#2108206210}), what I'm talking about is the switches, the rotary fan speed and vent control switch module. What I think has happened is, the fan switch axle gets old and wallered out so it doesn't make the correct speed connection. Depending on how it slumps out of socket, (so to say), it either puts the fan speed on high or even picks a speed the contact lands on.... ( This is my opinion from how the switch is acting, and, I am a technician, but, I don't claim to know-it-all. ok? )

The temporary, shade tree mechanic fix I found is this....first, I will thump, with my middle finger and thumb - the fan switch, in a manner to knock it into it's center hole. If the thumping don't get it, I've centered my finger on the fan switch and pushed in. I have done this to a point, sometimes, I even feel / hear it click - as if clicking back into the backplate where maybe it's coming out from....? offering my opinion here. But, the end result was/is...using this method of thinking, I have been able to temporarily fix the fan switch and the action of the fan, to match the desired speed you've selected. I tried to look up the fan/vent control module and for the moment, I had no luck. Hope anything I said here helps you enjoy your Crossfire, just a little bit better.