Defroster only blowing out cold air
 

I recently purchased 1979 300SD 116 Benz. My defroster will only blow out cold air, and warm air on the side vents. In the owners manual it says that the defroster should blow out warm air. Any suggestions on where I should look would be helpful. Thank you very much!


Candy Verbeck

Check your slide lever cable. If it is operational you may have to dig into the dash to find the problem. If you have warm air from the side vent you know your heater core is OK. Probably one of the interior doors that route the air.

Where is Keizer?

Thank you very much for your info. Keizer is right by Salem in Oregon. Where is Broken Arrow at? Never heared of it. Thanks again!



Candy Verbeck

Broken Arrow is just S.E. of Tulsa, OK

Hey Steve, I'm in Fayetteville, Arkansas. Small Mercedes World.

Had the same problem with my 82 SL. The auxiliary water pump wasn't working. I fixed it and now my defosters blow hot air. The side vent air is also much hotter than it was. Why one would be much warmer than the other, I don't know.
Hope this helps you,Don