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I don't know what you are calling an "actuator". Take your pick. Just about everything on this page has to come from either a dealer or a bone yard, other than the heater core.
Is the temperature door not moving? Try checking the solder joints on R3 and R4 referenced in the link above. Resoldering the joints on both resistors fixed the temp door on my '89.
Are you talking about the electric thing that operates the door in the heater box ? I was looking at a 90? pick up truck the other day and the one on it looks a lot like the one on my 87.