Climate Control issues - Page 2 - Mercedes-Benz Forum
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post #11 of 27 (permalink) Old 06-11-2019, 07:16 AM
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FSM climate control operation

Up in the top section, there is a sticky 124 DIY thread. In there is the Factory Service Manual. Here's a link to the section on the Climate Control system operation:
http://www.w124-zone.com/downloads/M...ate/83-600.pdf
Give it a read through.

Your question 2, the mechanic is correct. The three automatic settings are, to follow your list:
a. High Speed.
b. Almost high speed slowly slowing down to almost low speed as the interior heats up or cools down.
c. Low speed.

There aren't any vacuum pods in the engine compartment, only around the HVAC unit under the dashboard. Depending on the outside air temp, the blower sometimes won't operate until the coolant gets up to some minimum temperature. Also, there is one plastic vacuum line under the dash near the gauge cluster that remains open (not connected to anything or capped) as it's a vent.
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post #12 of 27 (permalink) Old 06-11-2019, 07:19 AM
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Have you read about your HVAC system in the owner's manual? With everything set on "auto", the fan speed will vary from almost "high" speed to something very near minimum. Much of the fan speed is dependent on where you have your temp wheel set. The overhead light has a small grill where interior air is drawn in via the sampler motor, which sends the air to the temp sensor, which varies the fan speed.

There isn't a vacuum pod under the hood of the car. Use our search tool and look up "vacuum block distribution". The distribution block is behind the glove box/passenger airbag.

As for the fan delay at initial start - normal. In the winter months, the fan will not blow until the coolant temp is to a point that warm air comes from the vents..when keeping the system set to automatic.

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post #13 of 27 (permalink) Old 06-11-2019, 07:39 AM Thread Starter
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Many thanks for these replies!

Quote:
Originally Posted by Jayare View Post
Have you read about your HVAC system in the owner's manual? With everything set on "auto", the fan speed will vary from almost "high" speed to something very near minimum. Much of the fan speed is dependent on where you have your temp wheel set. The overhead light has a small grill where interior air is drawn in via the sampler motor, which sends the air to the temp sensor, which varies the fan speed.
Yeah, I just read it. The thing is, on auto setting it never gets near minimum. It goes from high to a little bit less high, but rarely ever does it get to near minimum. Whenever you're driving it never gets quiet in the car if you've got it on Auto, if you know what I mean? It's not a particularly relaxing drive if you're always listening to the sound of the blower fan.

However, another thing I've noticed is this;

Sometimes when the blower is on Auto setting there's barely coming any air coming out of the vents. It's as if it tries its best to cool the car down but the ventilation shafts are closed. Is this managed by the same vacuum pod in the dash?
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post #14 of 27 (permalink) Old 06-11-2019, 07:41 AM
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Where is the temperature wheel set?

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post #15 of 27 (permalink) Old 06-11-2019, 08:31 AM Thread Starter
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Where is the temperature wheel set?

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I've tried it at various settings. But usually at 22 degrees, the white part. If that's what you mean?
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post #16 of 27 (permalink) Old 06-11-2019, 10:36 AM
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Has someone replaced the blower motor?

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post #17 of 27 (permalink) Old 06-11-2019, 10:53 AM Thread Starter
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Has someone replaced the blower motor?

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Yes, both the blower motor and the blower resistor have been replaced. The blower motor has been replaced about 5 years ago and the blower resistor is brand new.
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post #18 of 27 (permalink) Old 06-11-2019, 12:33 PM
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When did the odd behavior begin?

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post #19 of 27 (permalink) Old 06-11-2019, 04:34 PM
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I don't bother with AUTO setting. Hi or Lo, whatever I need.
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post #20 of 27 (permalink) Old 06-11-2019, 08:17 PM
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Many thanks for these replies!



Yeah, I just read it. The thing is, on auto setting it never gets near minimum. It goes from high to a little bit less high, but rarely ever does it get to near minimum. Whenever you're driving it never gets quiet in the car if you've got it on Auto, if you know what I mean? It's not a particularly relaxing drive if you're always listening to the sound of the blower fan.

However, another thing I've noticed is this;

Sometimes when the blower is on Auto setting there's barely coming any air coming out of the vents. It's as if it tries its best to cool the car down but the ventilation shafts are closed. Is this managed by the same vacuum pod in the dash?
This is normal....I often push the switch for Low fan because on Auto it stays too noisy messing around trying to sustain the temp you set. The only caveat there is in the winter, because Low won't give you enough heat throughout.

Truthfully, the Germans screwed the pooch on the ergonomics of this system.

Kevin
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