Heater Control Cable

[eastcan]

All,
I am trying to install the heater control cable in my 74 Challenger (no A/C). Each time I try connecting it to the heater controls, the cable wants to kink as I try to operate the controls.  I must be doing something wrong, maybe restraining the cable end incorrectly.  Does anybody have any installation tips?   It is a brand-new cable.

[Chryco Psycho]

I assume the door moves freely with the cable disconnected ?
 the cable end should pinch under the spring retainer clip & be inline with the lever

[eastcan]

Yes the door moves freely when the cable is disconnected.