I recently charged my ac until it was full and it still won't blow cold. I also had my indy. check for leaks. None were found. The compressor is coming on.
Does this car have a cabin air filter that could be stopped up? I also noticed that the middle "auto fan button will not depress". It will not stay in. If the freon is topped off and there is no leak why won't the air blow cold? Thanks in advance.

1984 300d turbo 147k
install new monovalve repair kit $45.00 this site diy 10 min pull plug on top and 4 screws

where is the monovalve? Please elaborate more.