I have reviewed many articles in the forum but stiil haven't resolved my problem ,
I have a w210 e300td 1999 that blows hot air from every vents ,just the center vents are working fine (the two on the dash up to climate control unit).
I checked the duovalve and repaired it .Recirculating pump if fine.I did a diagnostic and no error codes were find .when engine is cold the air is cols from all vents , when engine is warming , the air warms too.
Here are my live data from the climate control unit after 5 minutes from engine start:
(temperature is in degrees celsius)
1 22
2 13
3 48
4 49
5 08
6 56
7 15
8 60
9- 03
10 2.3
11 2.5
12 4.3
20 2.0
21 06
22 00
23 100
24 12.9
40 74
41 30
42 72
43 136

Can someone please tell what might be the problem

 

It sounds like you are getting hot water into your heater core. I would pinch off the heater hose before the duovalve, and see if that solves your problem.

 

Do not pinch off any thing-----you will cause more damage.

Additionally I hate these type of posts because there is so much misinformation and just pure BS on the AC system---very hard to overcome

In any event,looking at your actual data all the data suggests that you have a sound AC system and there is absolutely nothing wrong with your duo valve

Secondly, the duo valve only controls the outflow of heated coolant from the heater core, therefore the less learned think that while in AC mode the heater core is empty-------WRONG it is full of coolant that slowly warms because there is no circulation,because the duo valve is not open!!

What does this have to do with your issue-----I believe you have a issue with the two blend flaps(initially open to allow both heated and cooled air to enter) that are controlled by the switch over valve behind the glove box. That SOV is controlled by the AC control unit.

To confirm this do a flap actual value test posted in the stickies and lets hope it is a faulty SOV and not the vacuum actuated flap control which would mean a dash removal to replace

 

Hello to you Plutoe and thanks for the quick answer ,If you intend the flap on the cabine filter?, that works fine , i checked it.. would you please tell me where are located the two blend flaps ,the faulty SOV and the vacuum actuated flap control?. Some pictures would really help . Thanks for everything

 

Do us all a favor---focus on the macro view first-----do the flap tests, there are twelve and all else will be clear!!

FYI At this point knowing where stuff is located is not important. What is important, are all the flaps working properly(opening and closing when directed by AC control)!!

 

yes , it is as you said plutoe the side fflaps are not working on both sides.On HI they blow air as they should ,on LO nothing happens they continue to blow warm air.
how do i proceed now ?

 

Regrettably, without factory diagnostic software to point you to the fault in either the flap vacuum actuator, SOV or AC control panel you can do nothing.

The one thing that you know for certain is your problem is being caused by two flaps not closing as they should.

The other thing that I would not do is take the car to a so called Indy.

The one thing that I would do is take the car to the dealer who has the diagnostic software and who will be able to quickly tell you where the fault is located-----and if its a faulty flap actuator----that is way above your pay grade to fix yourself----if its the SOV---you probably can do the job as long as you have access to WIS documents and careful.

If you don't know what WIS is then let the dealer do the work and you take the grand kids out for dinner!!

 

yes i have wis/asra and epc on my pc ... i'll see what i'll find out there . however thanks for alll . you helped me a lot

 

i can say something else if it can help . I diagnosted my w210 with an Autocom Car diagnostic system , and no error code where found , just some old error codes .after erasing them nothing where found . I have the DAS XENTRY too and would you please tell me how to diagnose the AC via the DAS . IS there something fancy that i have to do or just a simple complete diagnose ?

 

What country are you from???

There is nothing fancy about any tool as long as you know how to use it and understand the system that you want to diagnose.

Before you do any testing go to WIS and search by document number. Find document number GF8340P0999A-----go to the middle of the page and look for valve block location/purpose/function----then read the next five vacuum element documents

That will give you a basic understanding of the AC flap vacuum system???

I don't know what version of DAS you have, but just hook up and do a quick test. Then click on the AC control module----when you do that you will see DAS switch to the HHT tool interface, it is that interface that is used to test all the control modules on W210 cars, repeat all W210 cars---there are loads of tests find the valve block test and test.

Remember the system is vacuum not electrical like the W211 therefore the HHT can't test the vacuum actuator(you already did that via a flap test), but can test the valve block----is there a fault for the valve block????

Additionally when all the electropnumatic elements are found to be good then you check if the vacuum lines to the flaps are damaged,disconnected or what ever however to do that takes lots of hours!!!