Blower motor wont turn off

[Jalopy]

It won't turn off, anyone know why?

 

[Rickf]

Some year squares are always on low. Is "off" missing from the heater/defroster control?

 

[75gmck25]

Many GM vehicles have a blower motor that runs any time the ignition is on. For our trucks it varies by year, but I know it is continuous-run on my ‘75.

 

[Snoots]

If you're talking about your '73, the blower always runs on LOW. It's part of the ventilation system.

 

[Bextreme04]

Any square 1980 and earlier will not have an "off" setting for the blower. It will always run at least a little bit.

 

[gotyourgoat]

Any square 1980 and earlier will not have an "off" setting for the blower. It will always run at least a little bit.

Used to have a scan of an old GM advertisement touting this feature, since lost to a broken phone. They called it their constant cabin ventilation or something similar. It was across many if not all models, not just trucks.
I've heard a few times it was because of a lawsuit gm lost where some people died of asphyxia while sitting in running parked vehicles. Maybe Gm scrubbed this from the interwebs because I cannot seem to confirm that is indeed what brought constant cabin ventilation into our lives.


You could always just pull the one plug out of the heater box and make it always off.

 

[AuroraGirl]

You must be registered for see images attach

I think the complicated "air" system this car had makes sense now with that blower motor thing running all the time, there is the valves under dash on the left and the upper switch on the left and the heater stack says off, but its a 75 so maybe that was there way around it

 

[AuroraGirl]

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[Terry Wilkerson]

It won't turn off, anyone know why?

My 86 gmc the off is on the ac Def heat selector side. Off is all the way to the left.

 

[AuroraGirl]

1980 ad (not disputing terry just found thread in notifications )

You must be registered for see images attach

 

[SirSmartyPants]

Has anyone successfully rigged a switch/relay in one of these models, such that when the Off/Def/Heat selector is all the way left (Off) it turns off the blower motor?

 

[AuroraGirl]

Has anyone successfully rigged a switch/relay in one of these models, such that when the Off/Def/Heat selector is all the way left (Off) it turns off the blower motor?

It would be easier to just wire an on-off and mount it to the original face plate.

I didnt realize the motor being on with key on was an intentional thing before 1982-1984, so I put a switch inline the (I think) purple wire to the wiper speed switch, because I didnt want it running all the time. I dont have a faceplate, so it just hangs there.

 

[SirSmartyPants]

It would be easier to just wire an on-off and mount it to the original face plate.

I didnt realize the motor being on with key on was an intentional thing before 1982-1984, so I put a switch inline the (I think) purple wire to the wiper speed switch, because I didnt want it running all the time. I dont have a faceplate, so it just hangs there.

I thought about doing that, too. In fact, I ordered a switch for the purpose before deciding I didn't want to cut holes in my dash. I have a relay, and I've ordered a limit switch with a lever. I plan to mount the switch to the plate in the ventilation control unit so that it opens the circuit to the fan when the lever is in the Off position. I'll post pics if/when I get it working.