Heater or valve leak????? How to take it out????

Follow what GTGrinly said, take the entire box out. Start by removing the two hoses going into the firewall, then remove the 4 screws on the firewall that surround the blower motor. There`s a hanger on the right side, under the dash at your fresh air intake, you should be able to remove it from there with a long extension. Of course the control cables have to come off, see which way is easier for you to remove them.(sometimes it`s easier to remove the entire control).You should be about there. You could work it in the car but it`s a lot easier to work out of the car. If you get hung up just let us know. Good luck!