Individual Flap Check

WARNING: This page is about a different car, the 1997 Mercedes-Benz E420, 1997 Mercedes-Benz E320, and 1997 Mercedes-Benz E300. However, it is still accessible from the selected car via links, so may be relevant.

Individual climate control vent flap operation can be checked using ACC push-button control unit. Temperature display areas will display test codes for each activated flap as well as flap position.
Start and run engine at idle. Press left and right AUTO buttons. Set temperature to 72°F. Manually open center and side air outlets. Press REST button and recirculated air button, and hold for more than 5 seconds. Left display area will display "0" and right display area will display LO.
Press left AUTO button to individually display stored test codes 0-15. See VENT FLAP TEST . Press right AUTO button to switch between HI or LO. When last flap position is indicated, first flap position will display. Press REST button to end individual test.

NOTE: Two-stage vacuum actuators function only at full stroke (100 percent) when long stroke (80 percent) and short stroke (20 percent) are pressed. Pressing short stroke (20 percent) by itself does not change flap position.

VENT FLAP TEST

Test Code

Activated Flap

Test Condition

Right Display

Normal Operation/Air Output

All

⁽¹⁾

All Flaps Closed, Defroster Open

All

⁽¹⁾

All Flaps Open

Left Diverter Flap ⁽²⁾

⁽¹⁾

Left Center Outlet Closed

Left Diverter Flap ⁽²⁾

⁽¹⁾

Left Center Outlet Open, Cold Air

Right Diverter Flap ⁽²⁾

⁽¹⁾

Right Center Outlet Closed

Right Diverter Flap ⁽²⁾

⁽¹⁾

Right Center Outlet Open, Cold Air

Left Blend Air Flap ⁽²⁾

⁽¹⁾

Left Center Outlet Closed

Left Blend Air Flap ⁽²⁾

⁽¹⁾

Left Center Outlet, Warm Air

Right Blend Air Flap ⁽²⁾

⁽¹⁾

Right Center Outlet, Closed

Right Blend Air Flap ⁽²⁾

⁽¹⁾

Right Center Outlet, Warm Air

Left Defroster Flap Long Stroke ⁽³⁾

⁽¹⁾

Side Defroster, Air Leak

Left Defroster Flap Long Stroke ⁽³⁾

⁽¹⁾

Side Defroster, Maximum Air

Left Defroster FlapLong & Short Stroke ⁽³⁾

⁽¹⁾

Left Defroster Outlet Closed

Left Defroster FlapLong & Short Stroke ⁽³⁾

⁽¹⁾

Left Defroster Outlet Open

Right Defroster Flap Long Stroke ⁽⁴⁾

⁽¹⁾

Right Defroster Flap Open, Air Leak

Right Defroster Flap Long Stroke ⁽⁴⁾

⁽¹⁾

Right Defroster Flap Open

Right Defroster Flap Long & Short Stroke ⁽⁴⁾

⁽¹⁾

Right Defroster Flap Closed

Right Defroster Flap Long & Short Stroke ⁽⁴⁾

⁽¹⁾

Right Defroster Flap Open

Main Air Flap Long Stroke ⁽⁵⁾

⁽¹⁾

Fresh Air

Main Air Flap Long Stroke ⁽⁵⁾

⁽¹⁾

Recirculated Air

Main Air Flap Long & Short Stroke

⁽¹⁾

Fresh Air

Main Air Flap Long & Short Stroke

⁽¹⁾

100 Percent Recirculated Air

Left Footwell Flap Long Stroke ⁽²⁾

⁽¹⁾

Left Footwell Flap Closed

Left Footwell Flap Long Stroke ⁽²⁾

⁽¹⁾

Left Footwell Flap Open, Air Leak

Left Footwell FlapLong & Short Stroke ⁽²⁾

⁽¹⁾

Left Footwell Flap, Air Leak

Left Footwell FlapLong & Short Stroke ⁽²⁾

⁽¹⁾

Left Footwell Flap Open

Right Footwell Flap Long Stroke ⁽²⁾

⁽¹⁾

Right Footwell Flap Closed

Right Footwell Flap Long Stroke ⁽²⁾

⁽¹⁾

Right Footwell Flap Open, Air Leak

Right Footwell FlapLong & Short Stroke ⁽²⁾

⁽¹⁾

Right Footwell Flap, Air Leak

Right Footwell FlapLong & Short Stroke ⁽²⁾

⁽¹⁾

Right Footwell Flap Open

All Flaps

⁽¹⁾

All Flaps Closed

All Flaps

⁽¹⁾

All Flaps Open

⁽¹⁾	Press Right AUTO.

⁽²⁾	Left and right defroster outlets will also be activated (long and short stroke).

⁽³⁾	Right defroster flap will also be activated (long and short stroke).

⁽⁴⁾	Left defroster flap will also be activated (long and short stroke).

⁽⁵⁾	Left and right blend air flaps will also be activated.