Technical 1957 Olds 98 with factory AC, heater blower motor resistor location

Have an issue with the heater blower motor running too slow.

Tests @ 6V on high at the blower, 5V on low and 6V on defrost.

Based on the factory wiring diagram, the low and hi run through a resistor and defrost byp***es the resistor runs on battery voltage.

This car has factory AC and a separate blower motor for AC.
That resistor is mounted on the AC box under hood and runs as normal with all speeds with a separate AC control switch.

Blower motor seems to run fine if jumped with 12V at the blower motor.

Anybody know where the heater blower motor resistor is located?

Factory service manual does not show location, cannot find under hood or under dash and is not attached to the heater controls in the dash.

Looked at images of a few used heater boxes on eBay inside/outside car and is not there as far as I can see.

Bill

 

Can you follow the wiring harness from the heater fan switch to the resistor?

 

If you have voltage at the motor, the resistor may be good. I'd check what kind of voltage you have out of the blower switch. High speed should by-p*** the resistor, so 6 volts on high means you have a probem with either the switch or the feed to the switch.

 

Google says it’s under the p***enger side dash. Will have two hex head screws holding it.

 

Found it.
It is inside the heater box, under the dash and not accessible without removing heater box.
Customer doesn't want to fix at this time.
Thanks for the suggestions.

Bill