It does change the speed if you really listen to it. Owner thought it doesn’t at all. Just trying to find out whether it is all of them like that. Don’t know whether some aftermarket resistor was used, but parts manual shows a resistor ( it means motor is not PWM controlled), and JD “really proud” of those!Sounds like something jumpered at switch, or contacts have fused in switch. Not sure if this unit changes the speed in the motor winding as some do.
Need Schematic to find out.
Simon C
Thanks! I’ll try that.Unplug the pressurizer blower and retest hvac blower. While you're in there, verify that the evaporator isn't dirt blocked.