can these little motors go bad (under dash on/around heater box) and more importantly can i get them anywhere new. thank you

 

Are you talking about the vacuum valve on the heater hose, the vacuum duct selector switch or what? Post a picture and location if you can.

 

i'll try and get a pic soon, but for now the best i can say is not the control on the driver's side and not the valve in the engine compartment. these motors/actuators are mounted on the heater box itself and have vacuum lines going in them. perfect example is the one you see under the dash on the passenger side. i feel that these may be faulty or even the switch under the dash that is mounted on the heater box itself. i believe it is some vacuum switch because it has a line goin in and out leading to the valve in the engine compartment. this leaks air/vacuum as i can hear it when the car is on so my heat problem is definitely vacuum influenced. pictures will be up soon.

 

 

Man am I glad I have a '67. Cable-linkages ftw...

 

i'm pretty sure the 67 heating is the same as the 68. correct me on that one, but anyway i found the new parts at mustangsunlimited.com

can i test these vacuum motors? can they go bad?