Leaking Servo - Mercedes-Benz Forum

 
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post #1 of 10 (permalink) Old 04-08-2014, 09:03 PM Thread Starter
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Leaking Servo

My servo is leaking coolant. I reconnected the hoses and hoping I did not crack it by connecting them wrong.

How are the hoses connected, does anyone have a diagram?

Also is there a way to remove this thing and still have A/C in summertime?

Thank you and please help!
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post #2 of 10 (permalink) Old 04-09-2014, 06:03 AM
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Please post what car you have.

coolant and AC have nothing to do with each other. what do you mean by "servo"

can you post a picture?
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post #3 of 10 (permalink) Old 04-09-2014, 07:49 AM
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what model of car ?????
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post #4 of 10 (permalink) Old 04-09-2014, 08:40 AM
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Originally Posted by Dayminder View Post
My servo is leaking coolant. I reconnected the hoses and hoping I did not crack it by connecting them wrong.

How are the hoses connected, does anyone have a diagram?

Also is there a way to remove this thing and still have A/C in summertime?

Thank you and please help!
What you can do is bypass the servo and run the hose from the aux water pump directly to the heater core. You can then install a shut-off valve on that hose to block the coolant in the summer. If the servo is otherwise functional, then yes, you will still have A/C in the summer.

There are also now reman sevos available for relatively reasonable money.


Mercedes Benz Climate Control Servo | eBay

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post #5 of 10 (permalink) Old 04-09-2014, 08:42 AM
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Please post what car you have.

coolant and AC have nothing to do with each other. what do you mean by "servo"

can you post a picture?

He is talking about the infamous old-style ACC servo, in which the coolant and the A/C very much did have something to do with each other. Said servo was seen in 107, 116 and early 123 cars.

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post #6 of 10 (permalink) Old 04-09-2014, 06:30 PM
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connect the 4 hoses the same way as they are on the servo with 2 pieces of pipe / clamps .now , the heater is on all time , install a shut off valve at the hose that is at the rear of head [ left rear ] now , if you tell me what model the car is , there is a way to install a 190e heater valve , so you will have remote control without butchering the car .
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post #7 of 10 (permalink) Old 04-20-2014, 06:54 PM Thread Starter
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Thanks. I cut off the supply of coolant to the servo. Now I have no heat (no problem with that) but not a leaky servo to cause an overheated engine.
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post #8 of 10 (permalink) Old 04-20-2014, 07:55 PM
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There is an aluminum bodied servo available, if you want to keep the factory look, or you can order the Unwired Tools replacement. UnwiredTools, LLC.
It has the reputation of being more trouble-free. I replaced my cracked, but working, servo in the 1981 380SLC 5.6 with the aluminum replacement and it functions well, most of the time. I also purchased the Unwired Tools product, but I haven't installed it yet. I plan to keep it as a backup in case the aluminum bodied servo fails.
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post #9 of 10 (permalink) Old 04-21-2014, 03:44 PM
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You need to understand the chain of events that lead to the acc system not working. The cracked servo is an obvious problem....and should be replaced..

Typically what happens to the system, is the aux water pump freezes, burns up the amplifier and then kills the small motor in the servo....there is also a foam sensor tube that crumbles to dust.
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post #10 of 10 (permalink) Old 04-21-2014, 04:36 PM
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Originally Posted by cooljjay View Post
You need to understand the chain of events that lead to the acc system not working. The cracked servo is an obvious problem....and should be replaced..

Typically what happens to the system, is the aux water pump freezes, burns up the amplifier and then kills the small motor in the servo....there is also a foam sensor tube that crumbles to dust.
What would cause the heater to come on all by itself even though the temperature dial is set to 65?
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