Climate Control issues - Mercedes-Benz Forum
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post #1 of 27 (permalink) Old 02-13-2019, 09:44 AM Thread Starter
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Climate Control issues

Hello all,

Hopefully someone can help me out here.

I own a 1990 300 CE with automatic climate control. It's not working. It's been to 4 mechanics, with the last one being a W124 specialist who's always been able to handle everything related to my W124 without needing to search endlessly. He has no idea how to solve this. It's now at it's 5th mechanic who has been able to get the airconditioning working, but that's about it. He runs a rather big climate control company here in the area (Rotterdam, The Netherlands) to which a lot of Benzes are send to when Mercedes doesn't know what to do with it. He's got no idea why the system is faulty either.

Here's the issue is:

I've got 2 control panels. Both should be good as they've been tested in other cars.

Installing control panel 1 (the original one): No reaction from the buttons, heater on top temperature and fan blows full speed. It can't be turned off.

Installing control panel 2 (replacement): Temperature can be switched to either zero or 40 degrees and fan can be set at three different speeds (with "auto" being one of them) but can't be turned off.

I currently have control panel 2 installed as that one gives me at least a few options.

I can press the recirculation buttong but it never works. However, occasionally the light in the recirculation button starts flickering and both the fan and control panel shut down and I get hot air instantly. Occasionally meaning once in a blue moon.

Anyone have any idea?

Many thanks!
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post #2 of 27 (permalink) Old 02-13-2019, 10:08 AM
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Exactly which climate control system did your car come with from the factory?

European spec cars were available with 3 different systems. The basic one has just 2 temperature dials, the semi automatic one is the same as basic plus air conditioning, and the full automatic type only has 1 temperature wheel and five buttons.

Also be aware that the systems are not interchangeable in any way shape or form, and each type requires its own specific form of diagnosis and repair.
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post #3 of 27 (permalink) Old 02-13-2019, 10:21 AM Thread Starter
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It's the one with 1 dial, 5 buttons and then 3 buttons on the side. It's the full automatic type.

The operating unit in the dash can be exchanced as long as it's one for the full automatic type. Hence me saying it's weird how 2 operating units work differently in my car yet the same in another car. It excludes the operating unit in my car from being faulty as they both work in other cars. They've been tested.
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post #4 of 27 (permalink) Old 02-13-2019, 10:26 AM
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Quote:
Originally Posted by RNRS001 View Post
It's the one with 1 dial, 5 buttons and then 3 buttons on the side. It's the full automatic type.

The operating unit in the dash can be exchanced as long as it's one for the full automatic type. Hence me saying it's weird how 2 operating units work differently in my car yet the same in another car. It excludes the operating unit in my car from being faulty as they both work in other cars. They've been tested.
Are the two cars the same models? Most of the climate controls are model specific and are not interchangeable.
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post #5 of 27 (permalink) Old 02-13-2019, 10:44 AM
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With the fully automatic type, replace the strip fuse on the driver side strut tower first and foremost. Doesn't matter if it "looks OK". Ditto for all the torpedo fuses in the main fuse box using the updated copper core ceramic type such as those made by Flosser. Dirt cheap part, and part that is known to cause strange issues.

The fact that your recirc light flickers on and off randomly tells me the system is getting power but not enough current (Amps) is being let through hence the fuse.
miltiano32 and vonkamp like this.

Last edited by sbaert; 02-13-2019 at 11:04 AM.
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post #6 of 27 (permalink) Old 02-13-2019, 10:51 AM
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One more thing, with the engine idling at full operating temp measure the voltage at the battery with and without the climate control turned on.

You should see a number between 13.5 and 14.5 Volt. Report back with your reading.

Last edited by sbaert; 02-13-2019 at 11:36 AM.
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post #7 of 27 (permalink) Old 02-13-2019, 03:45 PM
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When switching out climate control panels, did you ever have one of the plugs come apart and the wires pop out of their respective positions? I'm wondering if there are a couple of wires misplaced.

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post #8 of 27 (permalink) Old 02-15-2019, 02:48 PM
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I'm confused.

Is your only issue w/the replacement that the recirc doesn't work? Or do you have more issues?
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post #9 of 27 (permalink) Old 06-06-2019, 12:40 AM Thread Starter
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I apologize, I swore I had replied here last and was waiting for replies. Anyways...

Quote:
Originally Posted by tuttebenne View Post
When switching out climate control panels, did you ever have one of the plugs come apart and the wires pop out of their respective positions? I'm wondering if there are a couple of wires misplaced.
I didn't, but someone else clearly did. It's been at the garage and after installing a new blower regulator the fan still wouldn't shut down. A mechanic downloaded the wire schedules and started going through all of them individually. Eventually he opened one of the plugs going into the panel and the wires had all been replaced from position 1-14 to 3-16. Or something to that extend. It turned out to be an instant fix, according to him, and the car was returned to me.

However, I do have some questions;
1. After opening the center console one of the vacuum hoses in the dashboard wasn't connected to anything. The mechanic said he fixed it by putting a cap on it so air couldn't escape anymore. However, when turning on the climate control I always hear a sound coming out of the center ventilation shafts, if that's the right word?

https://photos.app.goo.gl/7R11GMy4sMdMrEBVA

The mechanic says the sound is normal "but might be more audible due to a faulty vacuumpod on the engine compartment". Whatever that means? Sometimes, after driving the car for several days, the blower fan won't start running after driving for several minutes. Can anyone tell me what's happening here?

2. After starting the car and pushing AUTO on the control panel the fan starts blowing full speed, then turns softer, but never gets remotely close to zero or the minimum speed. According to the mechanic this is because there's a button Minimum. If you want it at minimum you should put it at minimum. However, doesn't that make the purpose of the AUTO setting irrelvant? It's as if I've got 3 settings now:
a) High speed
b) High speed, then middle speed
c) Low speed

Can anyone tell me what the auto setting should do exactly?
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post #10 of 27 (permalink) Old 06-11-2019, 01:44 AM Thread Starter
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No one here who can answer these questions? Please, I really need some help with this.
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