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its possible that its not the motor mounts themselves that are bad. a number of things can cause short life or seemingly immediate failure of the motor mounts. such as a bad transmission mount and allowing ecessive torque to be applied to the motor mounts. think of anything that could cause poor allignment or positioning. weak or failing harmonic balancer, fluids leaking onto the mounts, possibly a mis-positioned chassis mount from the factory, or maybe somebody else molested it. a leak in the exaust even heating the rubber making it extreamly plyable and creating excessive streaching. I bought an 89 2wd astro once and pulled the tbi 4.3 v6 and dropped in a 305 v8 just by reversing the chassis mounts and buying new rubber mounts from advanced auto parts. probable would not have had to switch the mounts…but it set the motor back farther and allowed for extra clearance in the front. just my two cents I suppose.
this subject intreasts me, as I also have a ’94 astro with non-working “CC” Mine is just broke, checked vacume best I could, I think mine is an electrical connection issue, as it does not work at all. however, what are your driving conditions? most “CC” setups are designed to auto-off if there is more then a 10mph increase, or decrease in vehicle speed without adjusting the set point. I simply ask because I have driven mine up some medium grade hills, and the 4.3 vortec coupled with a 2.5 ton AWD is not the perfect setup for hilly terrain and it seems a “bit” under powered in terms of keeping speed while climbing a medium grade without shifting a lot. hope to see some “whats happening” posts soon!
this subject intreasts me, as I also have a ’94 astro with non-working “CC” Mine is just broke, checked vacume best I could, I think mine is an electrical connection issue, as it does not work at all. however, what are your driving conditions? most “CC” setups are designed to auto-off if there is more then a 10mph increase, or decrease in vehicle speed without adjusting the set point. I simply ask because I have driven mine up some medium grade hills, and the 4.3 vortec coupled with a 2.5 ton AWD is not the perfect setup for hilly terrain and it seems a “bit” under powered in terms of keeping speed while climbing a medium grade without shifting a lot. hope to see some “whats happening” posts soon!