I also believe I've got a blend door problem. I've got a 94SC 5-speed with 96k miles. However, mine hasn't been popping. This problem started a few years ago and is intermittent. I really didn't know what was going on till I found out how to get the code off the climate control system and the code indicated a blend door problem. My a/c works, however not like it should. I often get hot air blowing out. It generally does not cycle between hot and cold. When it is malfunctioning, it will only blow hot air. I've been reluctant to mess with it for same reason, cause you gotta pull the dash. If you pay a shop to do it, you're lookin' at about $600. I'm hoping to fix it this winter if I can get some time to do it. My problem is my SC is my daily driver. Want another car to drive so I can spend some qual time on the SC.