Overview. Cracked actuator diaphragms cause stuck HVAC flaps and vacuum leaks. This kit covers every actuator in the later R107 climate system.
Fitment
- 1981–85 380SL and 1986–89 560SL, North American models; other R107s of the same era with ACC III. Not a complete kit for the 450SL / 450SLC
Cross-reference part numbers (this kit rebuilds these Mercedes actuators):
- Center nozzle / central air duct flap: Mercedes-Benz A 116 800 19 75, A1168001975, 1168001975, 116 800 19 75, 116 800 1975, 116-800-19-75, 116.800.19.75
- Main air flaps, left and right (4 per car): Mercedes-Benz A 107 800 36 75, A1078003675, 1078003675, 107 800 36 75, 107 800 3675, 107-800-36-75, 107.800.36.75
- Fresh air flap: Mercedes-Benz A 107 800 26 75, A1078002675, 1078002675, 107 800 26 75, 107 800 2675, 107-800-26-75, 107.800.26.75
- Defroster nozzle flap: Mercedes-Benz A 000 800 32 75, A0008003275, 0008003275, 000 800 32 75, 000 800 3275, 000-800-32-75, 000.800.32.75
Lock plate / push nut included (6): Mercedes-Benz 912010-004002, 912010004002, N912010004002, N 912010 004002, 912010 004002
What’s included
| Actuator | Type | Qty |
|---|---|---|
| Center nozzle flap (116 800 19 75) | Deep single-stage | 1 |
| Main air, left (107 800 36 75) | Deep single-stage | 2 |
| Main air, right (107 800 36 75) | Deep single-stage | 2 |
| Fresh air flap (107 800 26 75) | Deep single-stage | 1 |
| Defroster nozzle (000 800 32 75) | Dual-stage cartridge, eyelet style | 1 |
Also included: 6 × Mercedes-Benz lock plate / push nut (912010-004002), not sold separately.
Installation
See the video instructions.
Rebuild tips
- Old actuator plastic can be brittle: open housings with 4 thin plastic strips (an old credit card works)
- Clean dust and debris from the housing; don’t use lubricants except dimethicone (lemon pledge)
- Stretch the diaphragm rim by hand just before closing the housing
- Test with a hand vacuum pump (e.g. Mityvac)
