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#1
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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. |
#2
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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 |
#3
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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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RM Smith 1988 560SL "Where is it again that we are going, and why are we in this handbasket"? |
#4
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you can also get a rebuilt "stainless" servo for just under $500
__________________
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 |
#5
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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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