Duovalve Removal and cleaning - Mercedes-Benz Forum
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#1 (permalink) Old 12-04-2007, 11:31 AM
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Duovalve Removal and cleaning

Hey, folks.

Since the directions to R&R and clean the duovalve are spread throughout a few threads across this forum I thought it would be useful to put them in one single post that we could sticky for the DIY thread.

Credits to: wood'sbenz, raymond- and netdvn for the following information:

Before starting, here are a few tips:

- BE SURE not to break off the small wiring attached to the gadget.
- BE SURE to pack towels beneath the duovalve to soak up spillage
- BE SURE not to drop screws or parts when removing and installing

The duovalve is located on passenger's side in the engine compartment. It is easy to spot as it has two small cylindrical aluminum cylinders. There are 5 torx (I think t-10) screws holding it together. With the car COLD, remove these torx screw (use a magnetic drive so as not to lose a screw). Leave the electrical connection alone. Once the screws are removed, gently remove the aluminum cap of the duovalve - pulling straight up - you may need to use a thin/flexible putty knife to GENTLY loosen it at first.

(When reinstalling, the two small screws in back side are tight clearance so you can use painter's tape and poke a hole for the screw. Before it's fully tight, tug on the tape and rip it out.)

After you remove the aluminum cap, you'll see two plungers in the lower portion of the valve. Gently remove the plungers, dry and clean them with a clean rag - you can use carb cleaner if they're really funky. Once cleaned, lubricate the lower portion of the plungers with some Vaseline and put everything back together.

(Greg's note re: lube... I haven't done this but I think that plumber's silicone grease would be more effective for lubing the plungers, not petroleum based, thinner so it's less likely to impede actuation of these little things, lasts longer, etc.)

netdvn's pics from the longest AC thread in this forum are seen below. Note that in this case he cleaned the duovalve with it installed in the car. If you're going to do the DIY fix from gt4rcdude then it's probably easier to remove the duovalve (personally I think I would remove it to clean it, less likely to drop things, etc.).


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Thanks again to all who contribute to this forum, it helps so many.

Take care and enjoy the ride,
Greg

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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#2 (permalink) Old 01-26-2008, 03:12 PM
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My duovalve looks different, where do I lube the plungers, the section inside the springs? Thanks!




W210 1996 E320 Exterior Smoke Silver, Interior Mushroom, 159,999 miles as of 09/09/09, 170K as of 02/01/2011.

Last edited by texholdem; 03-05-2009 at 07:30 PM.
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#3 (permalink) Old 01-29-2008, 08:54 AM
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Anyone can give answer to the question where to lube the plungers of 1996 E320 duovalve, the cone, the shaft or the spring? Thanks!


W210 1996 E320 Exterior Smoke Silver, Interior Mushroom, 159,999 miles as of 09/09/09, 170K as of 02/01/2011.

Last edited by texholdem; 03-05-2009 at 07:30 PM.
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#4 (permalink) Old 04-26-2008, 11:44 PM
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I managed to do mine today at work. After listening to everyone else I was so careful and knew what to expect I did not loose anything and I did not have to cover the body cracks and crevices. I did however draw blood from my thumb trying to unplug the connector, boy your fingers have to be tiny to reach down in there. After 30 minutes of trying and nursing my injury I then realized that the connector does not have to be unplugged. Here are some pics for future reference so folks can see different views of what it looks like and how the electrical connector does not have to be unplugged.
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#5 (permalink) Old 04-27-2008, 07:09 AM
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Hey, danboy...

You might want to check on the type of coolant in your car... The pic looks shows the looking pretty "greenish" and the correct coolant has a golden/amber hue.

JR
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#6 (permalink) Old 07-02-2008, 07:18 PM
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There is only one duovalve, and it regulates engine coolant flow through the heater cores.

Set the temperature control to "LO" on both sides and turn off the AC compressor by pressing the EC button and turn the fan on low. Then measure the air temperature at the dash vents on each side.

Under these conditions, if one side is hotter than the other, the problem lies in the duovalve or the pushbutton unit.
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#7 (permalink) Old 07-05-2008, 10:21 AM
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Ok so I cleaned the duovalve, but I'm still getting error code
B1226
B1231
I haven't checked the diverter flap because I don't know where it is. Plus could someone tell me where is the "firewall."
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#8 (permalink) Old 07-05-2008, 02:18 PM
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Did you

run How to Diagnose Air Conditioning Malfunctions | EclassBenz.com
write down the values and errors and clear the errors?
firewall is the bulkhead that separates the engine bay from the passenger compartment.
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#9 (permalink) Old 07-05-2008, 03:50 PM
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Well, after cleaning the duovalve, the air still doesn't come out from the right vent as strong and it does from the left vent. Do you think this is an indication of the blower regulator malfunction?
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#10 (permalink) Old 07-05-2008, 04:34 PM
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Duo-valve would be indicated when temps

were far apart.Air flow could be a stuck flap.Check your pse.
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