when i turn the air on i can hear it cut on but nothing blows out. if i turn the defrost or defog - it works and i can feel cold air at my feet and at the windows but its not enough to cool down the car. I have a 6 month old and i hate putting him in the car ever bc i know he's miserable and i don't want him to get sick from being too hot. I recharged the thing with the hose and can.. and it blew cold for a second but stopped blowing. please help me ! thank you!