I checked mine as well. NO flow out of the center vents when on heat. Hard to believe we all have faulty vacuum lines simultaneously in different parts of the US.

Also, a search for 'center vent' on other sites shows feedback from mods, etc. that no flow is the normal condition.

chamnya - have you tried redirecting the 'flow' from the side vents toward the center of the car with the vent controls? that should help some.

 

same here, no hot air in center.

 

bullet 4
it's 25f in the N.W. today and I have warm air from the center vents.

 

Well, if you could figure out why some of us do and some don't, I'd be all ears.

 

don't want that

 

Cute. But seriously you're the expert why is your car different than the rest of us. Perhaps these 'valve doors' have a return spring to close them when the vacuum is cut. If so and yours had a broken spring that would explain why you get hot air. Unless of course it's just bouncing off the dash.

 

As far as I know, it is by design. The center air outlets are only used for cool air.

If you look at the picture, it does show that only cool air comes out of the center outlets.

Granted, the last description in the text, does not coolate with that.

 

The common thread seems to be that hot air comes out the side vents, and cold air comes out the center. I think the explanation for warm and cool air coming from all the vents is probably something to do with the way air is blending to get the right temperature coming from the climate control system. For those of you who are getting warm air from your center vents, what happens as you increase the temperature? as it goes into higher ranges do you get more and more air coming from the sides?

 

I have warm air from the center vents on both my 320 and 430. The side vents do seem to prodce more airflow, but there is heat coming from the center.

 

Why should we expect logical and consistant operation when our cars have the most over-engineered and counter-intuitive climate control systems ever made. Missile guidance systems are less complicated.

I love my car but the old fashioned 3 knob system from my Jeep would be an improvement. Press the Econ button to turn off the AC, the defrost button to roast you with 100 degree air,resid button to give heat when the engine is off. Ever try to explain this stuff to the non-Mercedes driver that periodically shows up your driver seat? Don't even get me started about Rain Sensing Wipers but no Auto Headlights, or the complicated (and troublesome) passenger seat occupancy sensor systems designed specifically for an infant seat that nobody in there right mind would ever use.

 

Did you ever get it fixed, or did you decide to got with Tromso cooling instead?

 

I wrecked the car....

 

Sinced this thread was started about an AC issue with a W210, I'm going to bravely post an AC issue I'm having with my other benz, 96 C280. I posted this on benzworld but I didn't get a single reply. I know, this forum is for W210 and I apologize, it won't happen again.

###
I have been having issues with my AC for a while. At first, it was a leak and the mechanic replaced the pressure switch, temp switch, receiver dryer, and the condenser. It worked like a charm for a month. Now it takes about 30 minutes for the AC to kick in, when it does, it blows nice cold air; I checked the freon and it appears its holding.

Here are my fault codes:

1 76
2 71
3 84
5 73
6 132
7 CL0
8 71

What does CLO mean?

 

I have never been to Tromsø by the way...

 

ich wusste, dass Du das nicht lassen konntest. Genauso war der Aasgar.

 

I'll go out on a limb and suggest "low", but I don't knwo for sure. My readings are similar right now, except sensor 7 is just "0". My AC clutch doesn't engage, so my first assumption is that the refrigerant is low due to a leak. I can verify that the sensor isn't broken by hooking up a gage to the low-side fill valve

 

Eeeh, I don't speak German very well

Are you saying you have been to Åsgård? That is the hospital in Tromsø

 

I had it checked for an AC leak, none found; it's holding freon. But it takes 30 minutes or so for the AC to start blowing cold; once it does, its nice cold air. I've been tackling this for months, I'm in Florida, it's going to get hot soon.

 

Perhaps it is the evaporator sensor, if the value is not good ,you get interference such as , airconditioning compressor will not start or start (own life) , blowing only warm air etc.

 

the some tips thread just posted.Run the tests,just as stated.Clear the errors,drive for a day and run the tests again.See what errors come back and also write down the values 1-8 and post them.

 

Hello,

I have a manual a/c temperature control (dial type) that does not seem to work. The compressor keeps running no matter how I try to raise the temperature. The cabin becomes freezing cold after 30 mins and the only way to stop it is to press the ECO button. I brought it into a workshop and the technician just said that the controls are faulty. Another workshop said that i just need to replace a sensor. Can someone please help me narrow down the fault?

 

I have the manual A/C also, you must keep in mind that it does not work like a climate control. So you need to have the EC button lit when it's not very warm/sunny weather otherwise the compressor is always engaged!

It may be the duovalve is stuck, not letting any (hot) coolant fluid through. The duovalve is located in the right rear part of the engine bay in front of the black box containing the ECU's. Try gently tapping the valve with a resin hammer or the handle of a large screwdriver and such.

 

Thanks for the quick response....will give a try today

 

EC light is not on
Car does not blow any cold air

Here are the readings;

1 - 31
2 - 25
3 - 35
4 - 35
5 - 34
6 - 49
7 - 07
8 - 30

Here are the error codes I get;

Eb1 - 419, 226, 227, 228, 229, 230, 232, 233,234, 416,419, 459, 422, 423

Any help will be much appreciated

Thanks,
Rock

 

I'd suggest clearing all the codes (use both auto buttons while on the error screen to erase; FF= No codes) and then drive it a bit before checking which codes came back.

If the evap temp sensor comes back, replace it.