I recently purchased a 1977 Grand Prix J Model with a 301 V8. I have 2 questions:

1. When the car is running it seems as though the blower motor is running because I feel a air coming from under the center of the dash (while just idling or driving). How can I check this problem out? Possible solution if it is indeed a problem?

2. The power door lock on the passanger side does not work. How can I check the problem? How hard is it to replace? Thanks.