My 2004 Tahoe was only blowing hot air in the rear. So from research I figured it was the blend actuator. So I have the rear panel off and get the old actuator off and go to put the new one on but the shaft it is supposed to go on is in the body of the unit and I can’t get it out. Anyone have any step by step instructions to take the body apart so I can get to the shaft and put it back through?