Heating/cooling system fan speed
Has to do with the resistor that controls the voltage for the different speeds of the blower motor. Replace it.
Rowefast: Thank you for your response. I have tried to find the electrical schematic for the system but haven't seen one yet. Now to look up the location for the resistor...I know about where it is, but getting to it is another thing.
Usually it is by the blower motor, follow the wires from the blower motor back to an electrical devise with a plugin. Sometimes easier said than done. In the mean time I will do some checking.
Ok I looked up some parts, there is also a HVAC Blower Motor Control Module and the resistor. Either or, or both could be bad, but chances are it would be the resistor.
I have to do it the inexpensive way first...the resistor. Thank you for your rapid response. P.S. I have just watched a video for replacing the resistor, it is above my work-grade (I fix computers). I have a locate garage that I have used before (and trust), I'll get them on this soon.
The blower motor control and resistor are the same. It just depends on if its auto or manual a/c controls. Per usual you are spot on Rowefast.
Hey thanks man!
Looking for a Used Grand Marquis in your area?
CarGurus has 1,745 nationwide Grand Marquis listings starting at $1,700.
Search Mercury Grand Marquis Questions
Mercury Grand Marquis Experts