PeachParts Mercedes-Benz Forum - View Single Post - W124 Climate Control Vacuum Valve Repair DIY

Jeremy5848 · #5 07-25-2010, 08:55 PM

Quote:

Originally Posted by jt20

I am struggling with the same exact problem in my W201. Thank you for being an electrical genius.

My 1984 has an outdated, cantankerous Y valve similar to the one shown. The later models have been updated and the arrangement has changed but all the pins remain the same.

Can I post pictures so we can review this? It is very similar, and perhaps you might suggest that I simply re-trace my unit.

Yes, please reply to this post and add your own pictures. Many of the parts on the W124 were first used in the W201 -- there are many similarities and also many differences. You can use the forum itself to host up to five pictures per post but the pictures are limited to 800x600 pixels and no more than 72 KB each. You can also use a service like Photobucket and have the pictures larger. I do both. The pictures in this thread are hosted by Photobucket.

I pulled the glovebox and lower dash panel and did the acid test on the solenoid valve in my '87. Fortunately, all seven valves made a satisfying "click." Here's a picture of what the solenoid valve looks like installed in the car and with the plug unplugged. I had to scrunch down in the footwell to get the picture. Of the eight pins you can see, the one in the upper right corner is common and the other seven each go to one of the solenoids. Putting 12 Volts between the common pin and one of the others should get you a nice "click." Any one that doesn't "click" means a bad solenoid (unlikely) or a bad solder connection.

Jeremy