I created this mod due to the reduce hot temperature coming from the floor / vent mode during the winter while DaGirls Rv is traveling. The caused of this reduce temperature is the airflow flapper door located in the front. During travels the flapper door allows the outside cold air flowing into the coach thereby reducing the hot air flow. To increase the temperature I needed a way to close the air flow flapper door without using screws, tape or any other unnecessary material.
Locate the following items on the outside firewall:
Vacuum pump (12Vdc motor pump), Vacuum accumulator (small black round plastic tank), and the diverter airflow valve connector to the air flow flapper door..
Purchase the following items, universal vacuum tee similar in picture and 3 feet of vacuum hose that fits the smallest end of the tee. Cut the vacuum into 2 pieces, 1 foot and 2 foot sections.
Locate the vacuum accumulator and remove the hose on the left side. Using the 1 foot section, insert the hose into the open port where you just removed the hose. Next insert the other end of the hose into the tee run. Insert the hose that you removed from the accumulator into the other side of the Tee Run. Take the 2 foot section of vacuum hose and insert one end into the Tee end of the fitting. Locate the diverter valve and remove the vacuum hose. Insect the other end of the 2 foot section hose to the diverter valve. Finally locate a suitable plug, golf tee or even a pop rivet will work, plug the original hose end you removed from the diverter valve.
You have now competed the mod to increase the temperature in your dash AC/Heater unit.
Size - 1/8" or 1/4" or 3/8"
Existing Vacuum Hose Flow