blower motor only on vent/ac

[DBSHEA]

I'm assuming it's the resistor but I'll reach out to you guys first. Factory ac car but all underhood parts are gone. I just hooked up my heater lines and the core is solid. Now the conundrum, on vent, ac and max ac the blower works on high and low. Switch to heat or Def, no air. All my vacuum actuators are working, but the blower isn't getting the signal. Suggestions?

 

[cdr]

sound like the main switch is bad,if the resistor was bad it would not work on any setting.

 

[A383Wing]

yea...yer push button switch is bad inside...you need a new one

 

[bigblock]

Maybe just wired incorrectly. Sounds like the blower wire and the ac clutch wires are swapped.

 

[brasil]

..my blower motor runs in the very slowest speed....if I switch on the ignition... ( had a 75 Poncho with AC ...was the same )
Sounds like it should be like this.....

Greetings Juergen