Individual Flap Check
WARNING: This page is about a different car, the 1999 Mercedes-Benz CLK430, 1999 Mercedes-Benz CLK320, and 1998 Mercedes-Benz CLK320. 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 A/C push-button control unit. Temperature display areas will display test codes for each activated flap as well as flap position. To activate test, proceed as follows:
- 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 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 table. 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.
If system does not operate as specified in VENT FLAP TEST, perform VACUUM SYSTEM TESTS .
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. Blower motor will be powered by 6 volts during test.
VENT FLAP TEST
| A/C DISPLAYED Test Code | Activated Flap (1) | Test Condition | Right Display | Normal Operation/Air Output | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | All | Press Right AUTO | LO | All Flaps Closed | ||||||||
| Press Right AUTO | HI | All Flaps Open | ||||||||||
| 01 | Left Diverter Flap (2) | Press Right AUTO | LO | Left Center Outlet Closed | ||||||||
| Press Right AUTO | HI | Left Center Outlet Open, Cold Air | ||||||||||
| 2 | Right Diverter Flap (2) | Press Right AUTO | LO | Right Center Outlet Closed | ||||||||
| Press Right AUTO | HI | Right Center Outlet Open, Cold Air | ||||||||||
| 3 | Left Blend Air Flap (2) | Press Right AUTO | LO | Left Center Outlet Closed | ||||||||
| Press Right AUTO | HI | Left Center Outlet, Warm Air | ||||||||||
| 4 | Right Blend Air Flap (2) | Press Right AUTO | LO | Right Center Outlet, Closed | ||||||||
| Press Right AUTO | HI | Right Center Outlet, Warm Air | ||||||||||
| 5 | Left Defroster Flap Long Stroke (3) | Press Right AUTO | LO | Side Defroster, Air Leak | ||||||||
| Press Right AUTO | HI | Side Defroster, Maximum Air | ||||||||||
| 6 | Left Defroster Flap Long & Short Stroke (3) | Press Right AUTO | LO | Left Defroster Outlet Closed | ||||||||
| Press Right AUTO | HI | Left Defroster Outlet Open | ||||||||||
| 7 | Right Defroster Flap Long Stroke (1) | Press Right AUTO | LO | Right Defroster Flap Open, Air Leak | ||||||||
| Press Right AUTO | HI | Right Defroster Flap Open | ||||||||||
| 8 | Right Defroster Flap Long & Short Stroke (1) | Press Right AUTO | LO | Right Defroster Flap Closed | ||||||||
| Press Right AUTO | HI | Right Defroster Flap Open | ||||||||||
| 9 | Main Air Flap Long Stroke (4) | Press Right AUTO | LO | Fresh Air | ||||||||
| Press Right AUTO | HI | Recirculated Air 80% | ||||||||||
| 10 | Main Air Flap Long & Short Stroke (4) | Press Right AUTO | LO | Fresh Air | ||||||||
| Press Right AUTO | HI | Recirculated Air 100% | ||||||||||
| 11 | Left Footwell Flap Long Stroke (2) | Press Right AUTO | LO | Left Footwell Flap Closed | ||||||||
| Press Right AUTO | HI | Left Footwell Flap Open, Air Leak | ||||||||||
| 12 | Left Footwell Flap Long & Short Stroke (2) | Press Right AUTO | LO | Left Footwell Flap, Air Leak | ||||||||
| Press Right AUTO | HI | Left Footwell Flap Open | ||||||||||
| 13 | Right Footwell Flap Long Stroke (2) | Press Right AUTO | LO | Right Footwell Flap Closed | ||||||||
| Press Right AUTO | HI | Right Footwell Flap Open, Air Leak | ||||||||||
| 14 | Right Footwell Flap Long & Short Stroke (2) | Press Right AUTO | LO | Right Footwell Flap, Air Leak | ||||||||
| Press Right AUTO | HI | Right Footwell Flap Open | ||||||||||
| 15 | All Flaps | Press Right AUTO | LO | All Flaps Closed | ||||||||
| Press Right AUTO | HI | All Flaps Open | ||||||||||
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