Mercedes-Benz Forum banner
Cancel

85 300SD not blowing once you move thermo past min

819 Views 8 Replies 7 Participants Last post by  mclare, 
T
Hey All,

I'm having an issue with my 85 300sd where the blower shuts off if you move the temp control past min. It will blow if it is on min but nothing past that. Defroster won't blow either. I can feel heat coming out. I was thinking maybe monoclave valve but wanted to see if anyone had any other ideas. Checked and replaced the fuses. I can get it to come on randomly once in a while but Sunday night it stopped working again. Any ideas are appreciated.

Thanks
Reply
Save
Like
1 - 1 of 9 Posts
mclare
RNT said:
Check mono valve, pushbutton unit and unplug the auxiliary water pump. The plug is in plain sight between the battery and mono valve. You may have a faulty aux water pump.

http://www.benzworld.org/forums/w12...-burning-up-your-pride.html?highlight=burning
Click to expand...
It's not the PBU or Aux pump. 99% it's the PBU.

I have replacements if needed.
Reply
Save
Like
1 - 1 of 9 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Mercedes-Benz Forum
BenzWorld.org forum is one of the largest Mercedes-Benz owner websites offering the most comprehensive collection of Mercedes-Benz information anywhere in the world. The site includes MB Forums, News, Galleries, Publications, Classifieds, Events and much more!
Full Forum Listing
Explore Our Forums
W126 S,SE,SEC,SEL,SD,SDL Class R/C107 SL/SLC Class W163 M-Class W124 E,CE,D,TD Class W210 E-Class
Top