With RPO C60

Check the operation of the air valves using the following chart. Put Fan Switch in HI to give a strong flow of air (engine warm and running at idle).

^ If the test indicates only one valve is not operating correctly, make the following checks.

Air valve and vacuum actuator move freely.

- Vacuum hose is connected and not pinched.

- Vacuum is present when valve is moved from rest position. If vacuum is not present, replace the A/C Mode Selector.

^ If none of the valves operate, check for vacuum at the VIOLET hose to the Heater and A/C Control Assembly.