I have a 2001 honda passport, 6 cylinder, standard shift. My air conditioner only blows cold when the car is moving, but once I stop and idle the air blows warm. Can you point me in the right direction? Also when shifting it is very difficult to shift in any gear to another gear about 70 % of the time. I recently tried adding coolant but the gauge read in the yellow which indicated a warning and said the system may be overcharged, and recommended seeking professional help.