Can a Gen2 Climate Control unit work in a Gen1? - Mercedes-Benz Forum
 
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post #1 of 9 (permalink) Old 06-04-2019, 09:18 PM Thread Starter
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Can a Gen2 Climate Control unit work in a Gen1?

I know the way it mounts to the dash wood are different, but assuming I swapped that over too, would the physical unit work?

My current Gen1 unit is going bad and won't close the defrost vents. I have some good Gen2 units I think which I was thinking I would swap in.

Thoughts?
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post #2 of 9 (permalink) Old 06-05-2019, 06:15 AM
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Hi there,

I may be misunderstanding you as to what is meant by the word 'units', but if you mean the vacuum pod actuator [101] for defroster nozzle flap A0008004375, it is the same Gen 1 to Gen 2.

Hope that sheds some light.

M.
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post #3 of 9 (permalink) Old 06-05-2019, 09:14 AM
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I think he means the overall unit (where the push buttons and scrollie wheel are)

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post #4 of 9 (permalink) Old 06-05-2019, 09:56 AM
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No. It’s also different dimensions as well as the plugs are different.
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post #5 of 9 (permalink) Old 06-05-2019, 10:03 AM
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Yes, he is referring to the actual controller.

A comparison between the electrical schematics of Gen 1 and Gen 2 will offer the first clue. There were some things changed between the two generations, just like the window switches and for that reason the windows switches are not easily interchangeable. That may also be the case with the climate controller, although I am inclined to believe that in this case the interchange may be possible but the connectors may have to be swapped and wired differently.
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post #6 of 9 (permalink) Old 06-05-2019, 10:07 AM
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Originally Posted by roadhouse View Post
No. Itís also different dimensions as well as the plugs are different.
I envisioned that the dimensions may be different but wasn't sure. At any rate, he can solve that by using a Gen2 wood plate and then he deals with the electrical wiring. I am assuming that the overall dimensions of the wood plate are the same.

Or he can use parts from a Gen2 to repair the Gen1 unit.
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post #7 of 9 (permalink) Old 06-05-2019, 11:12 AM
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How different are they in actual operation? My 560SEC's auto setting was terrific. As I altered the temp dial it would reduce in strength gradually, much like a modern system. Not as advanced, but noticeable. With my 500SEC Auto is essentially 60 to 65% strength and nothing less. It never lowers in power.
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post #8 of 9 (permalink) Old 06-05-2019, 10:48 PM
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If my memory is correct, 20 years ago I had a GenI SEC and when the auxiliary heater water pump failed it would "take out" the controller and would require either a replacement or rebuild as the circuit board inside would fry a couple contacts. Haven't seen this happen on GenII. One would imagine improvements were added to the GenII units. Same buttons but different circuits inside.
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post #9 of 9 (permalink) Old 06-06-2019, 08:07 AM
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Not closing the defrost vents is a function of a vacuum pod. These fail. I'd bet that this pod is dying or there are significant vacuum leaks elsewhere that won't allow enough vacuum to that pod. Pull off the right side of the console to get to the vacuum manifold, pull a vacuum on the line going to that pod and see if 1. it holds a vacuum (isn't leaking) and 2. the defrost vent moves properly.

Pull the center vent air direction control thingys (the vanes you move to blow the air right/left) and you can see this pod about a foot inside the dash.

I changed out that pod's rubber diaphragm without disassembling the dashboard to get the pod in/out, but it was a PITA.
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