No Heat - W140 - Page 2 - PeachParts Mercedes-Benz Forum

sab · #16 06-08-2003, 03:58 PM

I have not gotten it resolved, but I have been out of town working most of the time. I will definetely tackle it this coming week or next.
Oldsouth, I would be interested in your part.
Thanks for all the replies.

JimF · #17 06-09-2003, 11:32 AM

'95 and later, the procedures is a little different:

1) Set left wheel to red detent (HI) and right wheel to blue detent (LO);
2) Turn ON ignition;
3) Press AUTO (displays show HI/LO);
4) Within 20secs simultaneously press REST and EC buttons for more than 5 sec.
5) The LED in the RECIRCULATE button flashes and "OFF" appears in the display.
6) Press the right 'AUTO' button until all DTCs are displayed and recorded.
7) To erase all, codes must be read out. Press both 'AUTO' buttons simultaneously for more than 5 secs. "d" will be displayed on the left and "FF" is displayed on the right.

Try that out and let us know.

sab · #18 12-08-2003, 04:40 PM

OK, I finally got to spend a couple of hours on this problem.

I took the pump out which is located right in front of the two valves and it was not turning very well. Interesting machanism where a small impeller is driven through a magnet. I cleaned it and it works well now. But it did not change the condition.

I checked all water lines coming and going to the valves and pump and all had rusty water sitting in them, which I guess is due to it not working for a year now. I was able to get water out of all lines but one. There seem to be four lines going towards the firewall the two lower are larger in diameter and the two top ones are a bit smaller.

The very top hose (it runs on top back at the firewall) seems plugged. Nothing going in or coming out.

I assume that is not normal, can someone verify if that is normal? How can I troubleshoot this?
Is there a flow diagram?

Thanks,
Sab.