Seeking Assistance / Blower Motor
 

Greetings.

Just joined this day and am seeking assistance or technical help regarding the blower motor functionality on my 1986 Oldsmobile Cutlass Supreme Brougham - 2-Door coupe -5.0 Liter (307) -Vin Y. I’ve been trying to rectify a problem for about a month in trying to regain the ‘High Speed’ function. I currently have M1 and M2 but ‘High Speed’ does not work; just cut out one day.

I just performed Test D in backprobing the circuitry referencing the Olds manual

RESISTANCE:

A.) BRN and TAN ----------- 1.5 ± 1 ohm > My Reading 3.8
B.) TAN and LT BLU ------- .7 ± .5 ohm > My Reading 1.9
C.) LT BLUE and DK BLU------- .2 ± .1 OHM > My Reading 1.6

Changed out the relay, changed out the mode selector switch, changed out the speed switch, changed out the resistor. Whether the parts I purchased were no good is unknown. However, the resistance on back probing the resistor terminal seems not to be in uniform with the allowable readings. At this point, I really do not know where to look. Could a fusible link possibly be the cause? The resistor only controls the M1 and M2 speeds, bypassing the relay which supposedly energizes the contacts to move the current down line. Any assistance here would be truly appreciated. Posted on other forums as not many seem to know the technical aspects associated with the blower motor: too many variables.

Purchased a motor at Amazon, supposedly being the correct motor but did not work in my car; whirring loud noise and there were two vent holes as opposed to one on my O.E.M. blower motor. Accompanying this was that no counter weights were stationed on the fins of the impeller, maybe they’ve been done away with BUT those clips balance the armature to spin in a balanced motion. All help is appreciated as to the above. Have much more as this is just a starting point.

https://streamable.com/24z1b - Bum motor from Amazon

My wheels

https://cimg4.ibsrv.net/gimg/www.gmf...6cb3d6a3f9.png
Correct resistance displayed and the readings I obtained in the specs above.

High setting is direct 12 volts. If the circuitry is good and the motor is slow with 12 volts applied the motor is bad.

The motor is not slow, only not moving into 'high' from M1 and M2. I'm very much aware the motor is 12 v. I was concerned with the varying ohms while performing Test D. Can you elaborate upon that?

Replaced the motor that I received from Amazon as it was a bum motor.
https://streamable.com/24z1b

. . . and it works properly now?

* No, still not working. I've traced it down to the relay, actually the starter solenoid B + terminal at the fusible links. The red wire coming from the relay is only emitting or sending 9.5 v as opposed to the other two wires ( BLU & ORN) supplying 11.9 v. There is a voltage drop thereby causing the blower fan not to work on 'high' speed. Will be on the lift today.
https://cimg3.ibsrv.net/gimg/www.gmf...8e38e8760b.png

How does it run with 12 volts direct?

What???

It looks like, on post 39 of 46 over there, that cleaning the connectors fixed it:

. . . or: https://classicoldsmobile.com/forums...5/#post1227781

(While the odds seem high, there is no way available to me to completely verify that both synoptic12's are one and the same person, hence the "Someone named" above)