AC Blower Won't Stop

[kutsired]

I have a 94Q with 195k miles. Just yesterday my AC blower won't quit, even with the ignition in "acc". If I turn off engine and a/c, it just keeps on blowing, although no cold air. You could just hear the blower running. Any info will be much appreciated. Thanks.

[Q45tech]

Stuck high speed relay or HVAC control module..........replace relay first.

You were not clear if it was blowing at max speed?

[kutsired]

Thank you very much. Yes, it's blowing in max speed, although no air is coming out of the vents. You could just hear the sound. (Which one is the high speed relay? Sorry for dumb??? )

[maxnix]

Yes, it's blowing in max speed, although no air is coming out of the vents. You could just hear the sound.

Then your mixer door must have failed. Time to down load a manual and dive under the dash.

[kutsired]

Fixed!!! I went to Costa Mesa Infiniti and talked with the parts guy. He recommended a part to replace, 'cause he said it's not the first time someone asked him about this problem. Part is called "amplifier", Part #27761-85E01. Installed it and the problem is gone.

Thanks Dennis and Maxnix for the help.

[maxnix]

Oh, the speed controller that goes on the motor?

Don't quite understand why there was no airflow from the vents.