Blower motor runs constantly

[jchance]

I have a 1985 gmc factory ac truck and the blower motor wouldn't work I checked the relay and it was bad replaced it now the blower only runs on high and wont shut off even with the key off. Any suggestions? Thanks

 

[kdo58]

bad heater switch,

 

[89Suburban]

I have a 1985 gmc factory ac truck and the blower motor wouldn't work I checked the relay and it was bad replaced it now the blower only runs on high and wont shut off even with the key off. Any suggestions? Thanks

Wow I never heard of that problem before.