My system works OK until the ducts all quit putting out AC. It sounds like the fan is working hard from the increased noise, like something is blocking the air from the ducts. If I stop for gas and turn everything off for a while all is good again for a while. Then roar from the air box under the dash and no air out the ducts again. I've changed and trained the blend door actuator and the complete control module all new Delco stuff.. Also has a new compressor and fully charged, the compressor is not the issue it runs properly. HELP!!!!