Troubleshooting Hints - Air Delivery & Temperature Controls

1. Check for manifold vacuum at the BLACK hose to the Heater and A/C Control Assembly.
2. Check the operation of the Temperature Valve by moving the temperature lever rapidly back and forth several times. Listen for the valve to strike the stop at each end of its travel. If the sound indicates that the valve is not fully closing or opening, check the mechanical linkage between the valve and the Temperature Lever.