1997 Chevy Blazer 4WD 4x4 Not Working, Bad Vacuum Actuator!! Quick FIX!!

1997 Chevy Blazer 4wd Vacuum Actuator fail to operate. This was keeping the 4wd not to kick in and work properly. This is underneath the battery. I took out the actuator, cleaned around top, covered with duck tape, and heated with a hair dryer for airtight seal. So far so good until it gets replaced with a new one. Actually this was purchased new just six months before it failed again. Take that Advance Auto Parts, LOL.