I started to troubleshoot my non-functioning cruise control yesterday, beginning with the actuator. I applied 12V to one yellow wire going into one of the coils, and that appeared to let engine vacuum go to the bellows, so that seems to be OK. Does the other coil let atmospheric pressure into the bellows? Its hard to tell if that’s working or not, but I’ll assume that it is.
I noticed, however that the bellows does not seem to seal tightly to the stationary end plate; you can spin the bellows on the plate with some ease. Is this significant? Does the bellows need a tight seal to work properly? (I assume so since one wouldn’t want a big vacuum leak during cruise operation.)
Thanks for any advice you can offer.