Dual-Stage Vacuum Actuator Diaphragm Cartridge Assembly
Dual-Stage Vacuum Actuator Diaphragm Cartridge Assembly - Image 2
Dual-Stage Vacuum Actuator Diaphragm Cartridge Assembly - Image 3
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Dual-Stage Vacuum Actuator Diaphragm Cartridge Assembly - Image 5
Dual-Stage Vacuum Actuator Diaphragm Cartridge Assembly - Image 6

Dual-Stage Vacuum Actuator Diaphragm Cartridge Assembly

$59.95

Finally, a superior-quality dual-stage diaphragm cartridge assembly to rebuild Behr defrost and fresh-air flap actuators on a range of 1970s-1990s Mercedes. Sold individually; consider buying a complete kit for your vehicle as well.

  • For R107, W116, W123, W124, W126, W201 Mercedes
  • Complete press-fit cartridge: two diaphragms (27mm & 33mm depth), two drive pistons, and stainless spring
  • Choose eyelet (rivet) or clip (plastic clasp) linkage end
  • Linkage hardware included
SKU: DUALDIA02 Categories: , , , , , , , ,

Overview. Finally, a superior-quality cartridge assembly is available to rebuild the dual-stage vacuum actuators commonly found in R107, W123, W126, W124, W201. End the persistent vacuum leaks and poor A/C and heat performance by rebuilding with a top-notch replacement cartridge assembly from Klima Design Works.

With dual-stage actuators, the inner diaphragm (deep depth 33mm) is captive inside a non-serviceble press-fit cartridge, whereas the lead diaphragm ( shallow depth 27mm) is removable. When the inner diaphragm fails, the entire assembly must be replaced. The cartridge includes both diaphragms.

Fitment

Confirm visually (best way) or search by part number (mostly reliable). Note that there are two linkage styles to choose from:

  • Eylet-Style for riveted linkage (W116, R107, early W126). New linkage hardware included.
  • Clip-Style for reusable linkage clip (Late W126, W124, W201). Re-Use Existing Hardware.

Cross-reference part numbers (this cartridge rebuilds these Mercedes actuators, but is not limited to these numbers):

  • W123 defroster nozzle flap (eyelet style): Mercedes-Benz A 123 800 22 75, A1238002275, 1238002275, 123 800 22 75, 123 800 2275, 123-800-22-75, 123.800.22.75; A 123 800 32 75, A1238003275, 1238003275, 123 800 32 75, 123 800 3275, 123-800-32-75, 123.800.32.75
  • R107 defroster nozzle flap (eyelet style): Mercedes-Benz A 000 800 32 75, A0008003275, 0008003275, 000 800 32 75, 000 800 3275, 000-800-32-75, 000.800.32.75
  • W126 main air flap, right, Gen I (eyelet style): Mercedes-Benz A 000 800 37 75, A0008003775, 0008003775, 000 800 37 75, 000 800 3775, 000-800-37-75, 000.800.37.75
  • W126 main air flap, right, Gen II (clip style): Mercedes-Benz A 000 800 57 75, A0008005775, 0008005775, 000 800 57 75, 000 800 5775, 000-800-57-75, 000.800.57.75
  • W126 main air flap, left (clip style): Mercedes-Benz A 000 800 58 75, A0008005875, 0008005875, 000 800 58 75, 000 800 5875, 000-800-58-75, 000.800.58.75
  • W126 defroster nozzle flap (clip style): Mercedes-Benz A 000 800 43 75, A0008004375, 0008004375, 000 800 43 75, 000 800 4375, 000-800-43-75, 000.800.43.75
  • W126 main air flap (clip style): Mercedes-Benz A 000 800 60 75, A0008006075, 0008006075, 000 800 60 75, 000 800 6075, 000-800-60-75, 000.800.60.75
  • Dual-stage actuator (eyelet style): Mercedes-Benz A 000 800 36 75, A0008003675, 0008003675, 000 800 36 75, 000 800 3675, 000-800-36-75, 000.800.36.75
  • W124 defroster flap (clip style): Mercedes-Benz A 124 800 26 75, A1248002675, 1248002675, 124 800 26 75, 124 800 2675, 124-800-26-75, 124.800.26.75
  • W124 main air flap, pre-facelift (clip style): Mercedes-Benz A 124 800 04 75, A1248000475, 1248000475, 124 800 04 75, 124 800 0475, 124-800-04-75, 124.800.04.75
  • W124 main air flap, pre-facelift (clip style): Mercedes-Benz A 124 800 11 75, A1248001175, 1248001175, 124 800 11 75, 124 800 1175, 124-800-11-75, 124.800.11.75
  • W124 main air flap, post-facelift (clip style): Mercedes-Benz A 124 800 29 75, A1248002975, 1248002975, 124 800 29 75, 124 800 2975, 124-800-29-75, 124.800.29.75
  • W124 main air flap, post-facelift (clip style): Mercedes-Benz A 124 800 30 75, A1248003075, 1248003075, 124 800 30 75, 124 800 3075, 124-800-30-75, 124.800.30.75
  • W201 main air flap, late (clip style): Mercedes-Benz A 201 800 00 75, A2018000075, 2018000075, 201 800 00 75, 201 800 0075, 201-800-00-75, 201.800.00.75

What’s included

  • Dual-stage cartridge assembly (includes both diaphragms)
  • Hardware to re-attach the linkage is included only for eyelet-style

Installation

Rebuild tips

  • WATCH OUR VIDEOS!!!
  • Old actuator housings have plastic that 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 (can use dimethicone / Pledge during install)
  • Stretch the diaphragm rim by hand just before closing the housing (required)
  • Test with a hand vacuum pump (e.g. Mityvac)

You may need to drill out a rivet to move the linkage across.

Weight N/A
Linkage End Type

Eyelet Style for Rivets, Clip Style for Plastic Clasp

Product FAQs

Single-stage or dual-stage?

Dual-stage actuators have three positions, two vacuum chambers, and use two diaphragms. They have two vacuum lines attached to them. For example, on a W123 the defroster actuator is dual-stage, whereas the other actuators in the system are all single-stage.

Which linkage end do I need?

Look at how the linkage attaches to your actuator: a rivet through an eyelet, or a plastic clasp. All W123, W116 and R107s use eyelet style dual-stage actuators for the defrost. Early W126 uses a combination of both styles; later W126 is all clip-style. W201 and W124 always use clip-style.

My W124 has dual stage cartridges that are different in depth from one another? Does your cartridge assembly still fit?

Yes. W124s have three dual stage actuators, including one that is more limited in travel and depth. Our clip-style actuator will work in all three dual-stage actuators used in the W124. While the original cartridge in question has a shorter spring, the housing is ultimately what limits travel, and our cartridge works fine in operation.

Do I need to watch the install video to install these properly?

You betcha. If you're one of those people that has been rebuilding these actuators from cannibalized OE parts, you may have your own favored method for rebuilding these and feel confident in your skills. That's great, but please don't just dive in. New diaphragms have a slightly smaller rim diameter that needs to be stretched in the correct way so that the diaphragm tapers and rolls properly in operation. If you are using already stretched parts, you would not be aware of this requirement. We also introduce a safe way to open the housings that significantly reduces the risk of breaking the housing ears. So do yourself a favor and give the videos a watch!

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