MBWorld.org Forums - View Single Post - DIY: Installing a new Changeover/Heater Control Valve

Chiro · 07-28-2009, 02:05 PM

Great post ..thank you very much. Just finished the job last night so here is an few gems to help do the job.

1. When removing the plastic screws we destroyed all of them so get four new ones in advance.

2. the valve cost $55 in Vancouver Canada and was in stock and I assume the upgraded version.

3. when removing the plastic cover you will need to pull it away from the adhesive on the bottom part of the window...no big deal.

4. the plastic cover is held in by the four plastic screws and four or so positioning pins that you need to pull up on.

5. the large hose that is mentioned on the passanger side is simply a drain hose wit no connector attached to it. It simply pulls off its mount on the plastic cover.

6.Remove not only the winshield wipers but the whole wiper assembly as previously mentioned . It is only an additional 3 bolts ...simple ..no alignment issues on replacing ,very straight forward. I can't imagine doing this job without removing all.

7.I used two sets of needle nose plies to remove the retaining clips instead of hangar.

8.the hose with the clamp on it was easily removed with channel lock pliers.

9. The front connection (in front of the grommet) ws difficult to get off, I needed to wiggle it a few times and pull very hard. Replacing that connection was the most difficult part for us. You will notice that there are two notches on it for alignment. The o-ring inside was askew and it wasn't until we corrected that that we got it on.

10.I used clamps on the hoses to prevent coolant from escaping but it wasn't necessary.

11.All other 3 hoses went on easily.

12. Before putting everything bak together run the engine to check for any leaks.

13.Started at 7pm and finished at 930. Could do it now in less than one hour. Alldata quotes 1.3 hours plus diagnostics.

14. Replacing wiper linkage , motor . and wiper blades ..fast and easy(minutes)

15. When replacing plastic panel look for the positioning pins and guide tabs located on the plastic panel.

16. Good luck a fairly easy diy job thanks to this terrific post and great pics.

07-28-2009, 02:05 PM	#20
Chiro Junior Member Join Date: Jun 2007 Location: Vancouver Canada Posts: 30 Drives: 1991 190E:1998 E320 4Matic wagon : 2000 E320 4Matic	heat exchanger shut off valve Great post ..thank you very much. Just finished the job last night so here is an few gems to help do the job. 1. When removing the plastic screws we destroyed all of them so get four new ones in advance. 2. the valve cost $55 in Vancouver Canada and was in stock and I assume the upgraded version. 3. when removing the plastic cover you will need to pull it away from the adhesive on the bottom part of the window...no big deal. 4. the plastic cover is held in by the four plastic screws and four or so positioning pins that you need to pull up on. 5. the large hose that is mentioned on the passanger side is simply a drain hose wit no connector attached to it. It simply pulls off its mount on the plastic cover. 6.Remove not only the winshield wipers but the whole wiper assembly as previously mentioned . It is only an additional 3 bolts ...simple ..no alignment issues on replacing ,very straight forward. I can't imagine doing this job without removing all. 7.I used two sets of needle nose plies to remove the retaining clips instead of hangar. 8.the hose with the clamp on it was easily removed with channel lock pliers. 9. The front connection (in front of the grommet) ws difficult to get off, I needed to wiggle it a few times and pull very hard. Replacing that connection was the most difficult part for us. You will notice that there are two notches on it for alignment. The o-ring inside was askew and it wasn't until we corrected that that we got it on. 10.I used clamps on the hoses to prevent coolant from escaping but it wasn't necessary. 11.All other 3 hoses went on easily. 12. Before putting everything bak together run the engine to check for any leaks. 13.Started at 7pm and finished at 930. Could do it now in less than one hour. Alldata quotes 1.3 hours plus diagnostics. 14. Replacing wiper linkage , motor . and wiper blades ..fast and easy(minutes) 15. When replacing plastic panel look for the positioning pins and guide tabs located on the plastic panel. 16. Good luck a fairly easy diy job thanks to this terrific post and great pics.