Heater blower motor resistor replacement - what part and how?

[Animal Lawyer]

My blower motor (1973 factory ac car) has only one speed, so I believe it's time to replace the resistor. I found this part # D3FZ-19A706-A but I also keep seeing the scott drake reprop C8ZZ-19A706-A part number (with 4 contacts) at different dealers, some say it fits only 69-70, others say 68-73. Are they all the same or which do I need? Also, where is the resistor located behind the dash and what is the easiest (requiring the least disassembly) to change it?

 

[Don C]

That one from ScottDrake should be the correct one, just hope it works, because of their supplier's quality control. WCCC says the same one works for '69 to '73.

Resistor - Heater Switch to Blower Motor with A/C - Used for 1969 Mercury Cougar, 1970 Mercury Cougar, 1971 Mercury Cougar, 1972 Mercury Cougar, 1973 Mercury Cougar, 1969 Ford Mustang, 1970 Ford Mustang, 1971 Ford Mustang, 1972 Ford Mustang, 1973 Ford Mustang at West Coast Classic Cougar :: The Definitive 1967 - 1973 Mercury Cougar Parts Source (cougarpartscatalog.com)

It mounts on the blower case with the resistor coils facing in.

 

[Animal Lawyer]

It mounts on the blower case with the resistor coils facing in.

Thanks, what is the best way to access the blower case? Do I need to disembowel the entire center stack or is there an easy way in for this repair?

 

[Don C]

It faces the cabin, under the dash behind the glove compartment, shouldn't have to dismantle anything.

 

[droptop73]

If it's an A/C car its on the end of the blower motor case kind of above the gas pedal in the center of the car.  I took the driver's seat out to get at it comfortably but I need all the room I can get. I used the Scott Drake piece, so far so good.