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  #1  
Old 10-19-2010, 11:41 AM
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Simplest Way to Bypass Servo?

I want to bypass my broken servo, so I can defrost my windows in the morning, until I can find a suitable replacement. I did this once before by connecting the hose that's highest on the firewall to one of the other hoses using a pipe with shut-off valve in it. However, I can't remember which hose I connected to the other side of the shut off valve to get heat.

Thanks in advance.

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  #2  
Old 10-20-2010, 02:00 PM
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here you go

Urgent! W107 bypass for ACC Servo
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  #3  
Old 10-20-2010, 04:43 PM
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You do understand that, if you bypass your servo, you will loose the vacuum controlled ventilation "flaps" , and have no control over where the airflow emanates from... The top half of the servo directs the vacuum to the respective "pods" to open or close them. The default for the different flaps can be found in the MB service manual. You will want to review, I think...

Advertised on this board is a digital replacement. Kinda pricey, but I have heard reported from one user of satisfactory performance. UTwired, or similar... was a sponsor for a while, and add would come up atop the board...
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  #4  
Old 10-20-2010, 08:16 PM
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you can also get a rebuilt "stainless" servo for just under $500
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Ron
2015 Porsche Cayman - Elizabeth
2011 Porsche Cayman - Bond,James Bond
Sadly MERCEDESLESS - ALways LOOKING !
99 E320 THE Queen Mary - SOLD
62 220b - Dolly - Finally my Finny! Sadly SOLD
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
19 BMW X5 - Heaven on Wheels
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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  #5  
Old 10-24-2010, 08:17 AM
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Join Date: Jun 2008
Posts: 473
Thanks for the replies. I decided to bypass the coolant flow to the servo by (1) using a reducer to connect the 1/4" hose from the aux water pump and the 5/8" heater hose (2) a 5/8" nipple to connect the other, two, 5/8" hoses that enter and exit the servo nearest the firewall.

Since I left the vacuum lines and electrical connections on the servo, switching from defrost to bi-level slows the blower motor down, but doesn't allow me to control the temperature. However, I can live with that, at least until I decide whether to get a used or rebuilt servo.

I considered getting the digital version, but I can't justify paying an exorbitant price for a system that costs less than, and probably a lot less than, $100 to make, even considering start-up costs.

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