Heater blower

Thank you very much for this -- very helpful.
When I first got this car the heater blower worked fine, but I replaced the vacuum switch because the OFF button was jammed. The heater blower didn't work with the new switch so I reinstalled the old switch and heater blower still doesn't work, so I don't think the new switch is the problem. I have been poking around under the dash fixing various problems and I'm wondering if maybe I knocked a connection off somewhere. Now that I know where these components are I think I can reach up under there and feel if everything is connected.
Thank You for this help.