Thanks Ron and Tysamigo,

I just discovered another problem that went away after I replaced the Heater/AC blower motor.

My Astral has Auto Climate Control. With the temperature setting on cold, whenever I turned on the blower from off, straight to full speed, the Auto light to the left would come on, the AC compressor would fire up and air flow automatically switched to interior source only. It was as if I had turned the motor speed selector switch to Auto but I hadn't. I dismissed it as being a glitch in the onboard computer, annoying but I could live with it.

Today, I realized that the glitch had gone away and all speed settings and auto control functionality was faultless!

So I am guessing this could be another symptom of a blower motor with tight bearings?

Hope this helps.