WTF is wrong with the 190E? - Page 3 - Mercedes-Benz Forum

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post #21 of 59 (permalink) Old 05-12-2009, 05:12 PM
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What clicking sound? I don't remember that!
This is the first time I ever heard this buzzing sound inside the cabin, behind the cluster once I get the engine going by keeping the throttle down. The car wouldn't start otherwise.
I read it on another forum, as I recall.

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post #22 of 59 (permalink) Old 05-12-2009, 05:17 PM Thread Starter
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I read it on another forum, as I recall.
I have been in so many that it's not even funny anymore. I still don't recall a clicking sound, but maybe it was in reference to valve noises, I don't know, but I do I know is that this LOUD buzzing sound inside the dashboard is a first.
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post #23 of 59 (permalink) Old 05-12-2009, 05:24 PM
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Most people who have older cars have problems with them. I too like to fix everything myself but I draw a line when I spend days troubleshooting something with no results, or have a job that requires a high lift and plenty of time. I too have been burned by incompetent mechanics, including the ones at our local Mercedes dealership. I took my 300SD to them because the A/C compressor would not come on. After several hours of trobleshooting I was told that I needed the auto temperature controller box for $ 1,200! They charged me $ 180 for the diagnosis and I left. I bought the same controller for $ 230 from an aftermarket source, installed it and nothing! Over $ 400 down the drain and no results! So I stated troubleshooting the system myself. I found the problem in less than an hour. It was the thermostatic switch in series with the main A/C switch. Very clearly shown on the schematic. All I had to do was jumper the switch out of the circuit and the A/C compressor immediately came on. The replacement switch cost less than $ 50 and it took about an hour to install it.

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post #24 of 59 (permalink) Old 05-12-2009, 05:26 PM
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Originally Posted by drewprof View Post
I have been in so many that it's not even funny anymore. I still don't recall a clicking sound, but maybe it was in reference to valve noises, I don't know, but I do I know is that this LOUD buzzing sound inside the dashboard is a first.
No, is wasn't coming from under the hood, it was closer.

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post #25 of 59 (permalink) Old 05-12-2009, 05:28 PM Thread Starter
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No, is wasn't coming from under the hood, it was closer.
Well I did hear a hissing sound from the heating unit but that's not what I hear now.
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post #26 of 59 (permalink) Old 05-12-2009, 05:31 PM
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No, you seemed to be describing a clicking noise as if a relay had failed. You don't remember? No wonder you can't fix it.

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post #27 of 59 (permalink) Old 05-12-2009, 05:31 PM
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Well I did hear a hissing sound from the heating unit but that's not what I hear now.
A 5 ft rattlesnake hidden in the engine compartment?
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post #28 of 59 (permalink) Old 05-12-2009, 05:35 PM Thread Starter
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No, you seemed to be describing a clicking noise as if a relay had failed. You don't remember? No wonder you can't fix it.
Ah I remember! That's a single click! That happens when the engine shuts off. It's not in the cabin, it's the fuel pump that does that.
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post #29 of 59 (permalink) Old 05-12-2009, 05:49 PM
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Tell us again what the thing does when it stalls and when you can restart it.
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post #30 of 59 (permalink) Old 05-12-2009, 05:53 PM Thread Starter
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Tell us again what the thing does when it stalls and when you can restart it.
Well now it's screwed because I have the air mixture and EHA adjustments all off. Whatever I describe as the original stalling scenarios probably don't apply right now, specially with this buzzer business that sounds like a warning device of some sort.
Anyway, before I tinkered with the car, the car would stall randomly when I come to a stop such as a red light. It would also stall at start up.
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